### 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
theme_cache.outline_size = get_theme_constant(SNAME("outline_size"));
	theme_cache.outline_color = get_theme_color(SNAME("font_outline_color"));
	theme_cache.line_spacing = get_theme_constant(SNAME("line_spacing"));
	if (text.get_line_height() + theme_cache.line_spacing < 1) {
		WARN_PRINT("Line height is too small, please increase font_size and/or line_spacing");
	}
	theme_cache.background_color = get_theme_color(SNAME("background_color"));
	theme_cache.current_line_color = get_theme_color(SNAME("current_line_color"));
	theme_cache.word_highlighted_color = get_theme_color(SNAME("word_highlighted_color"));
}
void TextEdit::_update_caches() {
	
	TextServer::Direction dir;
	if (text_direction == Control::TEXT_DIRECTION_INHERITED) {
		dir = is_layout_rtl() ? TextServer::DIRECTION_RTL : TextServer::DIRECTION_LTR;
	} else {
		dir = (TextServer::Direction)text_direction;
	}
	text.set_direction_and_language(dir, (!language.is_empty()) ? language : TranslationServer::get_singleton()->get_tool_locale());
	text.set_draw_control_chars(draw_control_chars);
	text.set_font(theme_cache.font);
	text.set_font_size(theme_cache.font_size);
	text.invalidate_font();
	_update_placeholder();
	
	if (syntax_highlighter.is_valid()) {
		syntax_highlighter->set_text_edit(this);
	}
}
Size2 TextEdit::get_minimum_size() const {