### 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 (!selecting_enabled || !is_multiple_carets_enabled()) {
		return;
	}
	if (text.size() == 1 && text[0].length() == 0) {
		return;
	}
	
	
	int caret = get_caret_count() - 1;
	if (!has_selection(caret)) {
		select_word_under_caret(caret);
		return;
	}
	const String &highlighted_text = get_selected_text(caret);
	int column = get_selection_from_column(caret) + 1;
	int line = get_caret_line(caret);
	const Point2i next_occurrence = search(highlighted_text, SEARCH_MATCH_CASE, line, column);
	if (next_occurrence.x == -1 || next_occurrence.y == -1) {
		return;
	}
	int to_column = get_selection_to_column(caret) + 1;
	int end = next_occurrence.x + (to_column - column);
	int new_caret = add_caret(next_occurrence.y, end);
	if (new_caret != -1) {
		select(next_occurrence.y, next_occurrence.x, next_occurrence.y, end, new_caret);
		adjust_viewport_to_caret(new_caret);
		merge_overlapping_carets();
	}
}
void TextEdit::select(int p_from_line, int p_from_column, int p_to_line, int p_to_column, int p_caret) {