### Godot version

v4.0.3.stable.official [5222a99f5]
Master [6101240231600c871f5c5473872532c68ea3268c] (confirmed by https://github.com/godotengine/godot/issues/77666#issuecomment-1568952502)

### System information

Window 10

### Issue description

References are not unreferenced at the end of `if` scopes.

### Steps to reproduce

Copy, paste and run the snippet below, check the results:

```gdscript
extends Node


func _ready() -> void:
  var ref := RefCounted.new()
  var ref_count : int

  # OK
  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)

  # OK
  if true:
    var temp := ref
    temp = null

  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)

  # FAIL
  if true:
    var temp := ref

  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)
```

Output example:

```
Expected: 1, Result: 1
Expected: 1, Result: 1
Expected: 1, Result: 2
```

### Minimal reproduction project

N/A
if (p_is_nested) {
				
				GDScriptCodeGenerator::Address constant = codegen.add_constant(true);
				codegen.generator->write_and_right_operand(constant);
				codegen.generator->write_end_and(p_previous_test);
			} else if (!p_is_first) {
				
				GDScriptCodeGenerator::Address constant = codegen.add_constant(true);
				codegen.generator->write_or_right_operand(constant);
				codegen.generator->write_end_or(p_previous_test);
			} else {
				
				codegen.generator->write_assign_true(p_previous_test);
			}
			return p_previous_test;
	}
	ERR_FAIL_V_MSG(p_previous_test, "Reaching the end of pattern compilation without matching a pattern.");
}
void GDScriptCompiler::_add_locals_in_block(CodeGen &codegen, const GDScriptParser::SuiteNode *p_block) {
	for (int i = 0; i < p_block->locals.size(); i++) {
		if (p_block->locals[i].type == GDScriptParser::SuiteNode::Local::PARAMETER || p_block->locals[i].type == GDScriptParser::SuiteNode::Local::FOR_VARIABLE) {
			
			continue;
		}
		codegen.add_local(p_block->locals[i].name, _gdtype_from_datatype(p_block->locals[i].get_datatype(), codegen.script));
	}
}
Error GDScriptCompiler::_parse_block(CodeGen &codegen, const GDScriptParser::SuiteNode *p_block, bool p_add_locals) {