[FrameworkBundle] update docblock to not expose the internal class #46496
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The change was introduced in #44695 motivated by the idea to be able to use the
getServiceIds()andgetRemovedIds()methods which are Symfony-specific methods. Exposing theTestContainerhas the drawback of static analysis tools complaining about making use of internal classes. Since the interesting methods are part of the baseContainerclass which is not internal I propose to change the docblock to return an instance of this class instead.