### 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
for (int j = i + 1; j < caret_edit_order.size(); j++) {
				if (get_caret_line(caret_edit_order[j]) != get_caret_line(caret_idx)) {
					break;
				}
				if (has_selection(caret_edit_order[j]) && get_selection_from_line(caret_edit_order[j]) != get_caret_line(caret_idx)) {
					break;
				}
				if (!has_selection(caret_edit_order[j])) {
					i = j;
					caret_idx = caret_edit_order[i];
				}
			}
			if (get_caret_column(caret_idx) == curline_len) {
				continue;
			}
			
			next_column = curline_len;
			next_line = get_caret_line(caret_idx);
			
			for (int j = i - 1; j >= 0; j--) {
				if (get_caret_line(caret_edit_order[j]) != get_caret_line(caret_idx)) {
					break;
				}
				carets_to_remove.push_back(caret_edit_order[j]);
			}
		} else if (p_word && get_caret_column(caret_idx) < curline_len - 1) {
			
			int line = get_caret_line(caret_idx);
			int column = get_caret_column(caret_idx);
			PackedInt32Array words = TS->shaped_text_get_word_breaks(text.get_line_data(line)->get_rid());