### 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
int num_lines_before = round((viewport_offset_y) / minimap_line_height);
	int minimap_line = (v_scroll->get_max() <= minimap_visible_lines) ? -1 : first_vis_line;
	if (first_vis_line > 0 && minimap_line >= 0) {
		minimap_line -= get_next_visible_line_index_offset_from(first_vis_line, 0, -num_lines_before).x;
		minimap_line -= (minimap_line > 0 && smooth_scroll_enabled ? 1 : 0);
	}
	if (minimap_line < 0) {
		minimap_line = 0;
	}
	int row = minimap_line + Math::floor(rows);
	if (get_line_wrapping_mode() != LineWrappingMode::LINE_WRAPPING_NONE || _is_hiding_enabled()) {
		int f_ofs = get_next_visible_line_index_offset_from(minimap_line, first_visible_line_wrap_ofs, rows + (1 * SIGN(rows))).x - 1;
		if (rows < 0) {
			row = minimap_line - f_ofs;
		} else {
			row = minimap_line + f_ofs;
		}
	}
	if (row < 0) {
		row = 0;
	}
	if (row >= text.size()) {
		row = text.size() - 1;
	}
	return row;
}
bool TextEdit::is_dragging_cursor() const {
	return dragging_selection || dragging_minimap;
}
bool TextEdit::is_mouse_over_selection(bool p_edges, int p_caret) const {