### 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_V(p_line, text.size(), false);
	return text.is_hidden(p_line);
}
void TextEdit::_unhide_all_lines() {
	for (int i = 0; i < text.size(); i++) {
		text.set_hidden(i, false);
	}
	_update_scrollbars();
	queue_redraw();
}
void TextEdit::_set_line_as_hidden(int p_line, bool p_hidden) {
	ERR_FAIL_INDEX(p_line, text.size());
	if (text.is_hidden(p_line) == p_hidden) {
		return;
	}
	if (_is_hiding_enabled() || !p_hidden) {
		text.set_hidden(p_line, p_hidden);
	}
	queue_redraw();
}
void TextEdit::_set_symbol_lookup_word(const String &p_symbol) {
	if (lookup_symbol_word == p_symbol) {
		return;
	}
	lookup_symbol_word = p_symbol;
	queue_redraw();
}
void TextEdit::_handle_unicode_input_internal(const uint32_t p_unicode, int p_caret) {