### Godot version

v4.0.beta10.official [d0398f62f]

### System information

Windows 22H2, Compatibility, GeForce GTX 550 Ti

### Issue description

Multiple lines of error messages are copied without line breaks:
The script editor's error panel shows:
```
Line 6:Expected parameter name.
Line 6:Expected closing ")" after function parameters.
Line 6:Expected ":" after function declaration.
```
But selecting and copying them `ctrl c`, copies them without line breaks:
```
Line 6:Expected parameter name.Line 6:Expected closing ")" after function parameters.Line 6:Expected ":" after function declaration.
```


### Steps to reproduce

- start Godot
- open the attached project
- open the script `Node2D.gd`
The status bar shows an error message.
- click on the red circle with an x in it, and the number 3 to the right of the circle.
The script editor's error panel shows three messages:
>Line 6:Expected parameter name.
Line 6:Expected closing ")" after function parameters.
Line 6:Expected ":" after function declaration.

- select all three lines, and copy them `ctrl c`
- in the script editor, click on the empty line 12 to place the cursor there.
- paste `ctrl v`

### Expected
The copied lines should be pasted on three lines, as they appeared in the error panel.

### Observed
There are no line breaks, they appear on the same line:
```
Line 6:Expected parameter name.Line 6:Expected closing ")" after function parameters.Line 6:Expected ":" after function declaration.
```


### Minimal reproduction project

[issue, error messages copied without line breaks.zip](https://github.com/godotengine/godot/files/10361376/issue.error.messages.copied.without.line.breaks.zip)

case ScriptLanguage::LOOKUP_RESULT_CLASS_ANNOTATION: {
				emit_signal(SNAME("go_to_help"), "class_annotation:" + result.class_name + ":" + result.class_member);
			} break;
			case ScriptLanguage::LOOKUP_RESULT_CLASS_TBD_GLOBALSCOPE: {
				emit_signal(SNAME("go_to_help"), "class_global:" + result.class_name + ":" + result.class_member);
			} break;
			default: {
			}
		}
	} else if (ProjectSettings::get_singleton()->has_autoload(p_symbol)) {
		
		const ProjectSettings::AutoloadInfo &info = ProjectSettings::get_singleton()->get_autoload(p_symbol);
		if (info.is_singleton) {
			EditorNode::get_singleton()->load_scene(info.path);
		}
	} else if (p_symbol.is_relative_path()) {
		
		String path = _get_absolute_path(p_symbol);
		if (FileAccess::exists(path)) {
			List<String> scene_extensions;
			ResourceLoader::get_recognized_extensions_for_type("PackedScene", &scene_extensions);
			if (scene_extensions.find(path.get_extension())) {
				EditorNode::get_singleton()->load_scene(path);
			} else {
				EditorNode::get_singleton()->load_resource(path);
			}
		}
	}
}
void ScriptTextEditor::_validate_symbol(const String &p_symbol) {