### 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 (syntax_highlighter == p_syntax_highlighter && syntax_highlighter.is_valid() == p_syntax_highlighter.is_valid()) {
		return;
	}
	syntax_highlighter = p_syntax_highlighter;
	if (syntax_highlighter.is_valid()) {
		syntax_highlighter->set_text_edit(this);
	}
	queue_redraw();
}
Ref<SyntaxHighlighter> TextEdit::get_syntax_highlighter() const {
	return syntax_highlighter;
}
void TextEdit::set_highlight_current_line(bool p_enabled) {
	if (highlight_current_line == p_enabled) {
		return;
	}
	highlight_current_line = p_enabled;
	queue_redraw();
}
bool TextEdit::is_highlight_current_line_enabled() const {
	return highlight_current_line;
}
void TextEdit::set_highlight_all_occurrences(const bool p_enabled) {
	if (highlight_all_occurrences == p_enabled) {
		return;
	}
	highlight_all_occurrences = p_enabled;
	queue_redraw();
}
bool TextEdit::is_highlight_all_occurrences_enabled() const {