### 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
}
			}
		}
		_remove_text(get_caret_line(caret_idx), get_caret_column(caret_idx), next_line, next_column);
		adjust_carets_after_edit(caret_idx, get_caret_line(caret_idx), get_caret_column(caret_idx), next_line, next_column);
	}
	
	carets_to_remove.sort();
	for (int i = carets_to_remove.size() - 1; i >= 0; i--) {
		remove_caret(carets_to_remove[i]);
	}
	
	merge_overlapping_carets();
	end_action();
	queue_redraw();
}
void TextEdit::_move_caret_document_start(bool p_select) {
	remove_secondary_carets();
	if (p_select) {
		_pre_shift_selection(0);
	} else {
		deselect();
	}
	set_caret_line(0, false);
	set_caret_column(0);
	if (p_select) {
		_post_shift_selection(0);
	}
}
void TextEdit::_move_caret_document_end(bool p_select) {