### 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_caret, carets.size(), 0);
	return carets[p_caret].column;
}
int TextEdit::get_caret_wrap_index(int p_caret) const {
	ERR_FAIL_INDEX_V(p_caret, carets.size(), 0);
	return get_line_wrap_index_at_column(get_caret_line(p_caret), get_caret_column(p_caret));
}
String TextEdit::get_word_under_caret(int p_caret) const {
	ERR_FAIL_COND_V(p_caret > carets.size(), "");
	StringBuilder selected_text;
	for (int c = 0; c < carets.size(); c++) {
		if (p_caret != -1 && p_caret != c) {
			continue;
		}
		PackedInt32Array words = TS->shaped_text_get_word_breaks(text.get_line_data(get_caret_line(c))->get_rid());
		for (int i = 0; i < words.size(); i = i + 2) {
			if (words[i] <= get_caret_column(c) && words[i + 1] > get_caret_column(c)) {
				selected_text += text[get_caret_line(c)].substr(words[i], words[i + 1] - words[i]);
				if (p_caret == -1 && c != carets.size() - 1) {
					selected_text += "\n";
				}
			}
		}
	}
	return selected_text.as_string();
}
void TextEdit::set_selecting_enabled(const bool p_enabled) {