### 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
set_process_unhandled_key_input(true);
	text.set_tab_size(text.get_tab_size());
	h_scroll = memnew(HScrollBar);
	v_scroll = memnew(VScrollBar);
	add_child(h_scroll, false, INTERNAL_MODE_FRONT);
	add_child(v_scroll, false, INTERNAL_MODE_FRONT);
	h_scroll->connect("value_changed", callable_mp(this, &TextEdit::_scroll_moved));
	v_scroll->connect("value_changed", callable_mp(this, &TextEdit::_scroll_moved));
	v_scroll->connect("scrolling", callable_mp(this, &TextEdit::_v_scroll_input));
	
	caret_blink_timer = memnew(Timer);
	add_child(caret_blink_timer, false, INTERNAL_MODE_FRONT);
	caret_blink_timer->set_wait_time(0.65);
	caret_blink_timer->connect("timeout", callable_mp(this, &TextEdit::_toggle_draw_caret));
	set_caret_blink_enabled(false);
	
	click_select_held = memnew(Timer);
	add_child(click_select_held, false, INTERNAL_MODE_FRONT);
	click_select_held->set_wait_time(0.05);
	click_select_held->connect("timeout", callable_mp(this, &TextEdit::_click_selection_held));
	idle_detect = memnew(Timer);
	add_child(idle_detect, false, INTERNAL_MODE_FRONT);
	idle_detect->set_one_shot(true);
	idle_detect->set_wait_time(GLOBAL_GET("gui/timers/text_edit_idle_detect_sec"));
	idle_detect->connect("timeout", callable_mp(this, &TextEdit::_push_current_op));
	undo_stack_max_size = GLOBAL_GET("gui/common/text_edit_undo_stack_max_size");
	set_placeholder(p_placeholder);
	set_editable(true);
}