Make .apply() fail with exception

[azgabur]

Currently when doing changes to APIobject-s via the .apply() or .modify_and_apply() methods these can fail silently. This does not apply to class methods with @modify decorator as those will fail with assertion error (https://github.com/Kuadrant/testsuite/blob/main/testsuite/kubernetes/__init__.py#L90)

To fix this there are two solutions:

a) Rewrite all .apply() calls to class methods with @modify decorator
b) Override .apply() or .modify_and_apply() methods in class KubernetesObject to fail with assert if unsuccessful