Allow for a 'uri' condition in the container form

I have a custom condition with the id of "uri", as on some parts of our site we needed to set context rules based on the uri.

 * @Condition(
 *   id = "uri",
 *   label = @Translation("URI"),
 * )

As a result when I go to create or edit an existing container, when I hit save I'm hitting an error as there is some logic in ContainerTrait.php that assumes we are on the google tag settings form purely on the assumption that a field with the name "uri" isn't null.

However as the ContainerForm uses conditionsForm() to build dynamic conditions, this now adds a "uri" field. This obviously isn't the uri field the settings form is expected, and therefore errors occur.

Adding an extra check to make sure we are saving a form with the id google_tag_settings before loading and using the uri field should resolve this.