fix: Add missing owns/watches and test early-exit reconcile

[adwk67]

Description

Part of stackabletech/issues#878

--- PASS: kuttl (650.34s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/cluster-operation_superset-latest-6.1.0_openshift-false (650.33s)
PASS

This PR ensures that the operator now watches all resources that it creates and early-exits the reconcile action when the cluster is marked for deletion. This is tested at unit-test level, as well as by adding a step to one of the kuttl tests to delete all relevant objects and assert that they are re-created.

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

Author

• Changes are OpenShift compatible
• CRD changes approved
• CRD documentation for all fields, following the style guide.
• Helm chart can be installed and deployed operator works
• Integration tests passed (for non trivial changes)
• Changes need to be "offline" compatible
• Links to generated (nightly) docs added
• Release note snippet added in parent issue

Reviewer

• Code contains useful comments
• Code contains useful logging statements
• (Integration-)Test cases added
• Documentation added or updated. Follows the style guide.
• Changelog updated
• Cargo.toml only contains references to git tags (not specific commits or branches)

Acceptance

• Feature Tracker has been updated
• Proper release label has been added
• Links to generated (nightly) docs added
• Release note snippet added
• Add type/deprecation label & add to the deprecation schedule
• Add type/experimental label & add to the experimental features tracker

[maltesander]

Should the druid_controller get the early return as well?

[adwk67]

Should the druid_controller get the early return as well?

Added here 5e07795

[maltesander]

LGTM!