Cleanup fails to delete nodes with UTF8-chars in node-/file-name - failing silently!

This example from PagesCoreFunctionalTests#pageNodeWithUtf8Chars

fails since 6.3-hackathon/site-removal.

@Cleanup("website:/äëïöü")

 
Fixture usually works. (It may fail in rare cases, but that could be a timing issue).

(a) But Cleanup fails always - if the node name contains UTF8 characters.

(b) And additional problem is that Cleanup fails silently.
Cleanup must throw an exception if it fails!

Related to (b)
(c) Cleanup is called 2 times:

• @beforeEach
• @afterEach

See info.magnolia.test.fixture.JcrFixture.
Cleanup should be called only once  - @afterEach. That's actually a must, once (b) is fixed.