### 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
visible_width -= v_scroll->get_combined_minimum_size().width;
	}
	visible_width -= 20; 
	Vector2i caret_pos;
	
	if (ime_text.length() != 0 && ime_selection.x != 0) {
		caret_pos.x = _get_column_x_offset_for_line(get_caret_column(p_caret) + ime_selection.x, get_caret_line(p_caret), get_caret_column(p_caret));
	} else {
		caret_pos.x = _get_column_x_offset_for_line(get_caret_column(p_caret), get_caret_line(p_caret), get_caret_column(p_caret));
	}
	
	if (ime_text.length() != 0) {
		if (ime_selection.y != 0) {
			caret_pos.y = _get_column_x_offset_for_line(get_caret_column(p_caret) + ime_selection.x + ime_selection.y, get_caret_line(p_caret), get_caret_column(p_caret));
		} else {
			caret_pos.y = _get_column_x_offset_for_line(get_caret_column(p_caret) + ime_text.size(), get_caret_line(p_caret), get_caret_column(p_caret));
		}
	} else {
		caret_pos.y = caret_pos.x;
	}
	if (MAX(caret_pos.x, caret_pos.y) > (first_visible_col + visible_width)) {
		first_visible_col = MAX(caret_pos.x, caret_pos.y) - visible_width + 1;
	}
	if (MIN(caret_pos.x, caret_pos.y) < first_visible_col) {
		first_visible_col = MIN(caret_pos.x, caret_pos.y);
	}
	h_scroll->set_value(first_visible_col);
	queue_redraw();
}
void TextEdit::center_viewport_to_caret(int p_caret) {