Fake client doesn't implement delete propagation

[grantr]

Code under test may expect that setting PropagationPolicy to Foreground will cause child objects to be deleted before returning. Currently the fake client doesn't implement this, nor does it offer a hook to allow this behavior to be simulated (see #72).

[DirectXMan12]

/kind bug

[fejta-bot]

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[fejta-bot]

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[DirectXMan12]

While I'd accept a PR to contribute this, for various reasons outlined before, fake client code is not a priority, since we generally try to discourage its use.