### 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
xmargin_end -= minimap_width;
			}
			
			theme_cache.style_normal->draw(ci, Rect2(Point2(), size));
			if (!editable) {
				theme_cache.style_readonly->draw(ci, Rect2(Point2(), size));
				draw_caret = is_drawing_caret_when_editable_disabled();
			}
			if (has_focus()) {
				theme_cache.style_focus->draw(ci, Rect2(Point2(), size));
			}
			int visible_rows = get_visible_line_count() + 1;
			Color color = !editable ? theme_cache.font_readonly_color : theme_cache.font_color;
			if (theme_cache.background_color.a > 0.01) {
				RenderingServer::get_singleton()->canvas_item_add_rect(ci, Rect2(Point2i(), get_size()), theme_cache.background_color);
			}
			Vector<BraceMatchingData> brace_matching;
			if (highlight_matching_braces_enabled) {
				brace_matching.resize(carets.size());
				for (int caret = 0; caret < carets.size(); caret++) {
					if (get_caret_line(caret) < 0 || get_caret_line(caret) >= text.size() || get_caret_column(caret) < 0) {
						continue;
					}
					if (get_caret_column(caret) < text[get_caret_line(caret)].length()) {
						
						char32_t c = text[get_caret_line(caret)][get_caret_column(caret)];
						char32_t closec = 0;
						if (c == '[') {
							closec = ']';
						} else if (c == '{') {