### 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 (draw_caret_when_editable_disabled == p_enable) {
		return;
	}
	draw_caret_when_editable_disabled = p_enable;
	queue_redraw();
}
bool TextEdit::is_drawing_caret_when_editable_disabled() const {
	return draw_caret_when_editable_disabled;
}
void TextEdit::set_move_caret_on_right_click_enabled(const bool p_enabled) {
	move_caret_on_right_click = p_enabled;
}
bool TextEdit::is_move_caret_on_right_click_enabled() const {
	return move_caret_on_right_click;
}
void TextEdit::set_caret_mid_grapheme_enabled(const bool p_enabled) {
	caret_mid_grapheme_enabled = p_enabled;
}
bool TextEdit::is_caret_mid_grapheme_enabled() const {
	return caret_mid_grapheme_enabled;
}
void TextEdit::set_multiple_carets_enabled(bool p_enabled) {
	multi_carets_enabled = p_enabled;
	if (!multi_carets_enabled) {
		remove_secondary_carets();
	}
}
bool TextEdit::is_multiple_carets_enabled() const {