Ensures managers are not shared within tests #196
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This is probably one of the most sneaky and subtle aspect which potentially resulted in flaky tests. Indeed an entity manager does not only contain a connection (which unless you change it causes little issues) but also the UnitOfWork which contains a lot of internal state which sometimes we tamper with or for which the metadata changes from a test to another (which is no good if the old metadata is cached by doctrine somewhere).
In this PR we guarantee that the managers & co. are always fresh