Make Doctrine's dependency injection test less fragile.

[Doctrine][DependencyInjection] The test checks that a few items are ordered according to the value of their 'priority' attribute. However, a few of the items have the same value of this attribute. RegisterEventListenersAndSubscribersPass doesn't use a stable sorting, yet the test asserts that items that are 'equal' shall go in the original order. Modified so that the order of the original items is not checked.
Merge branch '2.3' into 2.4

* 2.3:
  Make Doctrine's dependency injection test less fragile.
  [Finder] [Iterator] Make the tests less fragile
  [Form][DateTime] Propagate invalid_message & invalid_message parameters to date & time sub widgets