### 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 (k->is_action("ui_text_select_all", true)) {
				select_all();
				accept_event();
				return;
			}
			if (k->is_action("ui_text_select_word_under_caret", true)) {
				select_word_under_caret();
				accept_event();
				return;
			}
			if (k->is_action("ui_text_add_selection_for_next_occurrence", true)) {
				add_selection_for_next_occurrence();
				accept_event();
				return;
			}
			if (k->is_action("ui_text_clear_carets_and_selection", true)) {
				
				if (_clear_carets_and_selection()) {
					accept_event();
					return;
				}
			}
			if (k->is_action("ui_cut", true)) {
				cut();
				accept_event();
				return;
			}
			if (k->is_action("ui_copy", true)) {
				copy();
				accept_event();