### 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 (words[j] < cc) {
							cc = words[j];
							break;
						}
					}
				}
				set_caret_column(cc, i == 0, i);
			}
		} else {
			
			if (get_caret_column(i) == 0) {
				if (get_caret_line(i) > 0) {
					set_caret_line(get_caret_line(i) - get_next_visible_line_offset_from(CLAMP(get_caret_line(i) - 1, 0, text.size() - 1), -1), false, true, 0, i);
					set_caret_column(text[get_caret_line(i)].length(), i == 0, i);
				}
			} else {
				if (caret_mid_grapheme_enabled) {
					set_caret_column(get_caret_column(i) - 1, i == 0, i);
				} else {
					set_caret_column(TS->shaped_text_prev_character_pos(text.get_line_data(get_caret_line(i))->get_rid(), get_caret_column(i)), i == 0, i);
				}
			}
		}
		if (p_select) {
			_post_shift_selection(i);
		}
	}
	merge_overlapping_carets();
}
void TextEdit::_move_caret_right(bool p_select, bool p_move_by_word) {