Install engine image cleanup policy after longhorn

Francois Eleouetrequested to merge
fix-kyverno-engine-image-cleanup-policy into main

What does this MR do and why?

Install the engine image cleanup policy in a dedicated unit that depends on longhorn and kyverno to ensure that CRDs are created when policy is installed.

Related reference(s)

Closes: #1835 (closed)

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