### Godot version

v4.0.beta13.official [caacade56]

### System information

Linux Ubuntu 20.04 with Unity desktop

### Issue description

When calling an undefined function in the shader editor with argument(s), such as `undefined_function(1)`, the error reads:

> Too many arguments for "undefined_function()" call. Expected at most 0 but received 1.

instead of the expected:

> No matching function found for: 'undefined_function'.

This is possibly a regression introduced in https://github.com/godotengine/godot/issues/18225, since the latter was focused on the arguments part.

To avoid such regression in the future, consider adding a unit test with this case (and, in fact, unit tests for the other signature errors too if there are not already).

### Steps to reproduce

1. Create a shader resource and open the shader editor
2. Enter `undefined_function(1);` in the fragment() definition

### Minimal reproduction project

N/A
for (const KeyValue<StringName, BuiltInInfo> &E : info[skip_function].built_ins) {
									ScriptLanguage::CodeCompletionKind kind = ScriptLanguage::CODE_COMPLETION_KIND_MEMBER;
									if (E.value.constant) {
										kind = ScriptLanguage::CODE_COMPLETION_KIND_CONSTANT;
									}
									matches.insert(E.key, kind);
								}
							}
						}
					} else {
						if (p_info.functions.has("global")) {
							for (const KeyValue<StringName, BuiltInInfo> &E : p_info.functions["global"].built_ins) {
								ScriptLanguage::CodeCompletionKind kind = ScriptLanguage::CODE_COMPLETION_KIND_MEMBER;
								if (E.value.constant) {
									kind = ScriptLanguage::CODE_COMPLETION_KIND_CONSTANT;
								}
								matches.insert(E.key, kind);
							}
						}
						if (p_info.functions.has("constants")) {
							for (const KeyValue<StringName, BuiltInInfo> &E : p_info.functions["constants"].built_ins) {
								ScriptLanguage::CodeCompletionKind kind = ScriptLanguage::CODE_COMPLETION_KIND_MEMBER;
								if (E.value.constant) {
									kind = ScriptLanguage::CODE_COMPLETION_KIND_CONSTANT;
								}
								matches.insert(E.key, kind);
							}
						}
						if (skip_function != StringName() && p_info.functions.has(skip_function)) {
							for (const KeyValue<StringName, BuiltInInfo> &E : p_info.functions[skip_function].built_ins) {