Fix integration test cleanup

[Kehrlann]

• A few lifecycle fixes here and there, ensuring the tests have the required dependencies.

• Removed unused SecureRandom bean

• The big chunck of this PR is to fix the "CloudFoundryCleaner" which was only called once. See explanation from the asociated commit:

  • CloudFoundryCleaner was not properly triggered on every test. In fact, it was only triggered when the integration test's TestContext would change, which was very infrequent (unsure it was ever triggered). It's possible the cleanup only ever happened when the test suite started.
  • This is because the "clean" method was linked to lifecycle methods of the CloudFoundryCleaner bean, which was only created once.
  • The solution is to add @DirtiesContext, to trigger a re-creation of this bean. We don't want to do it on every test, because it could add more that 1h to the whole test suite. To ensure that it is well understood why this annotation is there in the first place, we introduce the meta-annotation @CleanupCloudFoundryAfterClass.
  • Note that calling CloudFoundryCleaner#clean() directly in tests would not work, because that annotation deletes EVERYTHING, and then subsequent tests would not have an org, a space, etc to operate in. By using @DirtiesContext we ensure those other beans are recreated as well.
  • Lastly, I have a doubt that the CloudFoundryCleaner is even required. I believe deleting an org in current versions of CF deletes EVERYTHING within this org, so it should be enough. However, this would be a much bigger change to the tests, which we don't have the bandwidth to tackle at the moment.