### 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
return syntax_highlighter.is_null() && !setting_text ? Dictionary() : syntax_highlighter->get_line_syntax_highlighting(p_line);
}
void TextEdit::_text_changed_emit() {
	emit_signal(SNAME("text_changed"));
	text_changed_dirty = false;
}
void TextEdit::_insert_text(int p_line, int p_char, const String &p_text, int *r_end_line, int *r_end_char) {
	if (!setting_text && idle_detect->is_inside_tree()) {
		idle_detect->start();
	}
	if (undo_enabled) {
		_clear_redo();
	}
	int retline, retchar;
	_base_insert_text(p_line, p_char, p_text, retline, retchar);
	if (r_end_line) {
		*r_end_line = retline;
	}
	if (r_end_char) {
		*r_end_char = retchar;
	}
	if (!undo_enabled) {
		return;
	}
	
	TextOperation op;
	op.type = TextOperation::TYPE_INSERT;
	op.from_line = p_line;
	op.from_column = p_char;