### 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
for (int i = 0; i < text.size(); i++) {
		text.write[i].data_buf->set_width(width);
		text.write[i].data_buf->set_break_flags(brk_flags);
		if (tab_size_dirty) {
			if (tab_size > 0) {
				Vector<float> tabs;
				tabs.push_back(font->get_char_size(' ', font_size).width * tab_size);
				text.write[i].data_buf->tab_align(tabs);
			}
		}
		text.write[i].width = get_line_width(i);
	}
	tab_size_dirty = false;
	_calculate_max_line_width();
}
void TextEdit::Text::invalidate_font() {
	if (!is_dirty) {
		return;
	}
	max_width = -1;
	line_height = -1;
	if (font.is_valid() && font_size > 0) {
		font_height = font->get_height(font_size);
	}
	for (int i = 0; i < text.size(); i++) {
		invalidate_cache(i, -1, false);
	}
	is_dirty = false;
}
void TextEdit::Text::invalidate_all() {