### Godot version

4.0.2

### System information

Arch Linux

### Issue description

1. `main` calls `register_core_types`, which calls `IP::create()`, which calls `Thread::start` on the resolver thread
2. `Thread::callback` calls `ScriptServer::thread_enter()`, as "Scripts may need to attach a stack."
3. `ScriptServer::thread_enter()` accesses `ScriptServer::_languages`, which is still being initialized on the `main` thread by `initialize_gdscript_module`

```
Godot Engine v4.0.2.stable.custom_build.7a0977ce2 - https://godotengine.org
==================
WARNING: ThreadSanitizer: data race (pid=9426)
  Write of size 4 at 0x55615b187cd0 by main thread:
    #0 ScriptServer::register_language(ScriptLanguage*) /home/rcorre/src/godot/godot/core/object/script_language.cpp:177:28 (godot.linuxbsd.editor.x86_64.llvm.san+0x9e52ab9) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #1 initialize_gdscript_module(ModuleInitializationLevel) /home/rcorre/src/godot/godot/modules/gdscript/register_types.cpp:118:3 (godot.linuxbsd.editor.x86_64.llvm.san+0x36f9c6f) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #2 initialize_modules(ModuleInitializationLevel) /home/rcorre/src/godot/godot/modules/register_module_types.gen.cpp:93:2 (godot.linuxbsd.editor.x86_64.llvm.san+0x2f50499) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #3 Main::setup2(unsigned long) /home/rcorre/src/godot/godot/main/main.cpp:1961:2 (godot.linuxbsd.editor.x86_64.llvm.san+0x2f1d40d) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #4 Main::setup(char const*, int, char**, bool) /home/rcorre/src/godot/godot/main/main.cpp:1879:10 (godot.linuxbsd.editor.x86_64.llvm.san+0x2f16370) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #5 main /home/rcorre/src/godot/godot/platform/linuxbsd/godot_linuxbsd.cpp:61:14 (godot.linuxbsd.editor.x86_64.llvm.san+0x2e67e1f) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)

  Previous read of size 4 at 0x55615b187cd0 by thread T1:
    #0 ScriptServer::thread_enter() /home/rcorre/src/godot/godot/core/object/script_language.cpp:244:22 (godot.linuxbsd.editor.x86_64.llvm.san+0x9e54aed) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #1 Thread::callback(unsigned long, Thread::Settings const&, void (*)(void*), void*) /home/rcorre/src/godot/godot/core/os/thread.cpp:61:2 (godot.linuxbsd.editor.x86_64.llvm.san+0x9464ab0) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #2 void std::__invoke_impl<void, void (*)(unsigned long, Thread::Settings const&, void (*)(void*), void*), unsigned long, Thread::Settings, void (*)(void*), void*>(std::__invoke_other, void (*&&)(unsigned long, Thread::Settings const&, void (*)(void*), void*), unsigned long&&, Thread::Settings&&, void (*&&)(void*), void*&&) /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/12.2.1/../../../../include/c++/12.2.1/bits/invoke.h:61:14 (godot.linuxbsd.editor.x86_64.llvm.san+0x9465283) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #3 std::__invoke_result<void (*)(unsigned long, Thread::Settings const&, void (*)(void*), void*), unsigned long, Thread::Settings, void (*)(void*), void*>::type std::__invoke<void (*)(unsigned long, Thread::Settings const&, void (*)(void*), void*), unsigned long, Thread::Settings, void (*)(void*), void*>(void (*&&)(unsigned long, Thread::Settings const&, void (*)(void*), void*), unsigned long&&, Thread::Settings&&, void (*&&)(void*), void*&&) /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/12.2.1/../../../../include/c++/12.2.1/bits/invoke.h:96:14 (godot.linuxbsd.editor.x86_64.llvm.san+0x9465283)
    #4 void std::thread::_Invoker<std::tuple<void (*)(unsigned long, Thread::Settings const&, void (*)(void*), void*), unsigned long, Thread::Settings, void (*)(void*), void*>>::_M_invoke<0ul, 1ul, 2ul, 3ul, 4ul>(std::_Index_tuple<0ul, 1ul, 2ul, 3ul, 4ul>) /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/12.2.1/../../../../include/c++/12.2.1/bits/std_thread.h:258:13 (godot.linuxbsd.editor.x86_64.llvm.san+0x9465283)
    #5 std::thread::_Invoker<std::tuple<void (*)(unsigned long, Thread::Settings const&, void (*)(void*), void*), unsigned long, Thread::Settings, void (*)(void*), void*>>::operator()() /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/12.2.1/../../../../include/c++/12.2.1/bits/std_thread.h:265:11 (godot.linuxbsd.editor.x86_64.llvm.san+0x9465283)
    #6 std::thread::_State_impl<std::thread::_Invoker<std::tuple<void (*)(unsigned long, Thread::Settings const&, void (*)(void*), void*), unsigned long, Thread::Settings, void (*)(void*), void*>>>::_M_run() /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/12.2.1/../../../../include/c++/12.2.1/bits/std_thread.h:210:13 (godot.linuxbsd.editor.x86_64.llvm.san+0x9465283)
    #7 execute_native_thread_routine /usr/src/debug/gcc/gcc/libstdc++-v3/src/c++11/thread.cc:82:18 (libstdc++.so.6+0xd72c2) (BuildId: 6fe66a2d539a78c993bd2d377e00fad389220963)

  Location is global 'ScriptServer::_language_count' of size 4 at 0x55615b187cd0 (godot.linuxbsd.editor.x86_64.llvm.san+0xbf46cd0)

  Thread T1 (tid=9431, running) created by main thread at:
    #0 pthread_create <null> (godot.linuxbsd.editor.x86_64.llvm.san+0x2de5776) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #1 __gthread_create /usr/src/debug/gcc/gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:663:35 (libstdc++.so.6+0xd73a9) (BuildId: 6fe66a2d539a78c993bd2d377e00fad389220963)
    #2 std::thread::_M_start_thread(std::unique_ptr<std::thread::_State, std::default_delete<std::thread::_State>>, void (*)()) /usr/src/debug/gcc/gcc/libstdc++-v3/src/c++11/thread.cc:147:37 (libstdc++.so.6+0xd73a9)
    #3 IP::IP() /home/rcorre/src/godot/godot/core/io/ip.cpp:347:19 (godot.linuxbsd.editor.x86_64.llvm.san+0x962cbcd) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #4 IPUnix::IPUnix() /home/rcorre/src/godot/godot/drivers/unix/ip_unix.cpp:261:9 (godot.linuxbsd.editor.x86_64.llvm.san+0x4aee599) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #5 IPUnix::_create_unix() /home/rcorre/src/godot/godot/drivers/unix/ip_unix.cpp:258:9 (godot.linuxbsd.editor.x86_64.llvm.san+0x4aee599)
    #6 IP::create() /home/rcorre/src/godot/godot/core/io/ip.cpp:339:9 (godot.linuxbsd.editor.x86_64.llvm.san+0x962ca5e) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #7 register_core_types() /home/rcorre/src/godot/godot/core/register_core_types.cpp:279:7 (godot.linuxbsd.editor.x86_64.llvm.san+0x93e2333) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #8 Main::setup(char const*, int, char**, bool) /home/rcorre/src/godot/godot/main/main.cpp:690:2 (godot.linuxbsd.editor.x86_64.llvm.san+0x2f08a49) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)
    #9 main /home/rcorre/src/godot/godot/platform/linuxbsd/godot_linuxbsd.cpp:61:14 (godot.linuxbsd.editor.x86_64.llvm.san+0x2e67e1f) (BuildId: 780a9db7c37d88e78d5ee659c4fa1cd378abd048)

SUMMARY: ThreadSanitizer: data race /home/rcorre/src/godot/godot/core/object/script_language.cpp:177:28 in ScriptServer::register_language(ScriptLanguage*)
```

### Steps to reproduce

1. ` scons compiledb=yes debug_symbols=yes linker=mold  use_llvm=yes use_static_cpp=no target=editor use_tsan=yes`
2. `/bin/godot.linuxbsd.editor.x86_64.llvm.san`

### Minimal reproduction project

N/A
if (values.has(p_name)) {
		if (r_is_valid) {
			*r_is_valid = true;
		}
		return values[p_name].get_type();
	}
	if (constants.has(p_name)) {
		if (r_is_valid) {
			*r_is_valid = true;
		}
		return constants[p_name].get_type();
	}
	if (r_is_valid) {
		*r_is_valid = false;
	}
	return Variant::NIL;
}
void PlaceHolderScriptInstance::get_method_list(List<MethodInfo> *p_list) const {