### Godot version

4.1

### System information

Windows

### Issue description

Being able to have multiple cursors similarly to vscode is a great feature, however it's only possible to add carets, not remove them. By left clicking you can remove all extra cursors but you cannot remove a specific one so after selecting multiple lines a single missclick, you have to reselect them all again. Looking at the original pr there was a remove_caret function added so it would make sense to be able to remove carets when clicking again, like in vscode.

![image](https://github.com/godotengine/godot/assets/19669673/3867c00e-9faa-4429-9c6d-f2d6d3883044)


### Steps to reproduce

- Alt click to add multiple carets
- Alt click on the same position again
- Nothing happens

### Minimal reproduction project

N/A
if (editable && undo_enabled) {
		remove_secondary_carets();
		_move_caret_document_start(false);
		begin_complex_operation();
		_remove_text(0, 0, MAX(0, get_line_count() - 1), MAX(get_line(MAX(get_line_count() - 1, 0)).size() - 1, 0));
		insert_text_at_caret("");
		text.clear();
		end_complex_operation();
		return;
	}
	
	int old_text_size = text.size();
	clear_undo_history();
	text.clear();
	remove_secondary_carets();
	set_caret_line(0, false);
	set_caret_column(0);
	first_visible_col = 0;
	first_visible_line = 0;
	first_visible_line_wrap_ofs = 0;
	carets.write[0].last_fit_x = 0;
	deselect();
	emit_signal(SNAME("lines_edited_from"), old_text_size, 0);
}
void TextEdit::set_text(const String &p_text) {