### 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
ERR_FAIL_INDEX(p_gutter, gutters.size());
	if (gutters[p_gutter].custom_draw_callback == p_draw_callback) {
		return;
	}
	gutters.write[p_gutter].custom_draw_callback = p_draw_callback;
	queue_redraw();
}
void TextEdit::set_line_gutter_metadata(int p_line, int p_gutter, const Variant &p_metadata) {
	ERR_FAIL_INDEX(p_line, text.size());
	ERR_FAIL_INDEX(p_gutter, gutters.size());
	text.set_line_gutter_metadata(p_line, p_gutter, p_metadata);
}
Variant TextEdit::get_line_gutter_metadata(int p_line, int p_gutter) const {
	ERR_FAIL_INDEX_V(p_line, text.size(), "");
	ERR_FAIL_INDEX_V(p_gutter, gutters.size(), "");
	return text.get_line_gutter_metadata(p_line, p_gutter);
}
void TextEdit::set_line_gutter_text(int p_line, int p_gutter, const String &p_text) {
	ERR_FAIL_INDEX(p_line, text.size());
	ERR_FAIL_INDEX(p_gutter, gutters.size());
	if (text.get_line_gutter_text(p_line, p_gutter) == p_text) {
		return;
	}
	text.set_line_gutter_text(p_line, p_gutter, p_text);
	queue_redraw();
}
String TextEdit::get_line_gutter_text(int p_line, int p_gutter) const {