### 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
ERR_FAIL_COND(p_caret > carets.size());
	begin_complex_operation();
	Vector<int> caret_edit_order = get_caret_index_edit_order();
	for (const int &i : caret_edit_order) {
		if (p_caret != -1 && p_caret != i) {
			continue;
		}
		delete_selection(i);
		int from_line = get_caret_line(i);
		int from_col = get_caret_column(i);
		int new_column, new_line;
		_insert_text(from_line, from_col, p_text, &new_line, &new_column);
		_update_scrollbars();
		set_caret_line(new_line, false, true, 0, i);
		set_caret_column(new_column, i == 0, i);
		adjust_carets_after_edit(i, new_line, new_column, from_line, from_col);
	}
	if (!ime_text.is_empty()) {
		for (int i = 0; i < carets.size(); i++) {
			String t;
			if (get_caret_column(i) >= 0) {
				t = text[get_caret_line(i)].substr(0, get_caret_column(i)) + ime_text + text[get_caret_line(i)].substr(get_caret_column(i), text[get_caret_line(i)].length());
			} else {
				t = ime_text;