### 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)

CodeEdit *te = code_editor->get_text_editor();
	String text = te->get_text();
	List<String> fnc;
	warnings.clear();
	errors.clear();
	safe_lines.clear();
	if (!script->get_language()->validate(text, script->get_path(), &fnc, &errors, &warnings, &safe_lines)) {
		
		String error_text = vformat(TTR("Error at (%d, %d):"), errors[0].line, errors[0].column) + " " + errors[0].message;
		code_editor->set_error(error_text);
		code_editor->set_error_pos(errors[0].line - 1, errors[0].column - 1);
		script_is_valid = false;
	} else {
		code_editor->set_error("");
		if (!script->is_tool()) {
			script->set_source_code(text);
			script->update_exports();
			te->get_syntax_highlighter()->update_cache();
		}
		functions.clear();
		for (const String &E : fnc) {
			functions.push_back(E);
		}
		script_is_valid = true;
	}
	_update_connected_methods();
	_update_warnings();
	_update_errors();