### 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
carets.write[c].draw_pos.y = ofs_y + ldata->get_line_descent(line_wrap_index);
							if (ime_text.is_empty() || ime_selection.y == 0) {
								
								CaretInfo ts_caret;
								if (!str.is_empty() || !ime_text.is_empty()) {
									
									ts_caret = TS->shaped_text_get_carets(rid, ime_text.is_empty() ? get_caret_column(c) : get_caret_column(c) + ime_selection.x);
								} else {
									
									int h = theme_cache.font->get_height(theme_cache.font_size);
									if (rtl) {
										ts_caret.l_dir = TextServer::DIRECTION_RTL;
										ts_caret.l_caret = Rect2(Vector2(xmargin_end - char_margin + ofs_x, -h / 2), Size2(caret_width * 4, h));
									} else {
										ts_caret.l_dir = TextServer::DIRECTION_LTR;
										ts_caret.l_caret = Rect2(Vector2(char_ofs, -h / 2), Size2(caret_width * 4, h));
									}
								}
								if ((ts_caret.l_caret != Rect2() && (ts_caret.l_dir == TextServer::DIRECTION_AUTO || ts_caret.l_dir == (TextServer::Direction)input_direction)) || (ts_caret.t_caret == Rect2())) {
									carets.write[c].draw_pos.x = char_margin + ofs_x + ts_caret.l_caret.position.x;
								} else {
									carets.write[c].draw_pos.x = char_margin + ofs_x + ts_caret.t_caret.position.x;
								}
								if (get_caret_draw_pos(c).x >= xmargin_beg && get_caret_draw_pos(c).x < xmargin_end) {
									carets.write[c].visible = true;
									if (draw_caret || drag_caret_force_displayed) {
										if (caret_type == CaretType::CARET_TYPE_BLOCK || overtype_mode) {
											
											int h = theme_cache.font->get_height(theme_cache.font_size);
											if (ts_caret.t_caret != Rect2()) {