This enables experimental drift detection of cluster state compared to
the current manifest data from the Helm storage's manifest blob.
Drift detection works based on the already proven approach of the
kustomize-controller's SSA package, and utilizes the managed field
configured by the controller since `v0.12.2`.
This feature is planned to go out of experimental once the further
controller rewrite has been finished, and the state of the Helm storage
itself is more fault tolerant.
Signed-off-by: Hidde Beydals <hidde@hhh.computer>