### 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
Vector<Vector2i> ret;
	ERR_FAIL_INDEX_V(p_line, text.size(), ret);
	for (int i = 0; i < text[p_line].data_buf->get_line_count(); i++) {
		ret.push_back(text[p_line].data_buf->get_line_range(i));
	}
	return ret;
}
const Ref<TextParagraph> TextEdit::Text::get_line_data(int p_line) const {
	ERR_FAIL_INDEX_V(p_line, text.size(), Ref<TextParagraph>());
	return text[p_line].data_buf;
}
_FORCE_INLINE_ const String &TextEdit::Text::operator[](int p_line) const {
	return text[p_line].data;
}
void TextEdit::Text::_calculate_line_height() {
	int height = 0;
	for (const Line &l : text) {
		
		if (l.height == line_height) {
			height = line_height;
			break;
		}
		height = MAX(height, l.height);
	}
	line_height = height;
}
void TextEdit::Text::_calculate_max_line_width() {