### 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].line;
}
void TextEdit::set_caret_column(int p_col, bool p_adjust_viewport, int p_caret) {
	ERR_FAIL_INDEX(p_caret, carets.size());
	if (p_col < 0) {
		p_col = 0;
	}
	if (p_col > get_line(get_caret_line(p_caret)).length()) {
		p_col = get_line(get_caret_line(p_caret)).length();
	}
	bool caret_moved = get_caret_column(p_caret) != p_col;
	carets.write[p_caret].column = p_col;
	carets.write[p_caret].last_fit_x = _get_column_x_offset_for_line(get_caret_column(p_caret), get_caret_line(p_caret), get_caret_column(p_caret));
	if (is_inside_tree() && p_adjust_viewport) {
		adjust_viewport_to_caret(p_caret);
	}
	if (caret_moved && !caret_pos_dirty) {
		if (is_inside_tree()) {
			MessageQueue::get_singleton()->push_call(this, "_emit_caret_changed");
		}
		caret_pos_dirty = true;
	}
}
int TextEdit::get_caret_column(int p_caret) const {