### 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
bool is_match = true;
			if (pos != -1 && (p_search_flags & SEARCH_WHOLE_WORDS)) {
				
				if (pos > 0 && !is_symbol(text_line[pos - 1])) {
					is_match = false;
				} else if (pos + p_key.length() < text_line.length() && !is_symbol(text_line[pos + p_key.length()])) {
					is_match = false;
				}
			}
			if (pos_from == -1) {
				pos = -1;
			}
			if (is_match || last_pos == -1 || pos == -1) {
				break;
			}
			pos_from = (p_search_flags & SEARCH_BACKWARDS) ? pos - 1 : pos + 1;
			pos = -1;
		}
		if (pos != -1) {
			break;
		}
		if (p_search_flags & SEARCH_BACKWARDS) {
			line--;
		} else {
			line++;
		}
	}
	return (pos == -1) ? Point2i(-1, -1) : Point2i(pos, line);
}
Point2 TextEdit::get_local_mouse_pos() const {