refactor: Extract apply and update status steps

[adwk67]

Description

This PR covers the following:

• extracts apply and update_status steps
• moves secret creation to the apply step
• moves object_meta out of the validated cluster code (missed on the last iteration of PRs)
• ensure correct label versions are used in the tests (ditto)

Note

the Applier here deliberately diverges from the airflow shape (apply → apply_config_maps → finish, with orphan deletion only at the end) because the discovery ConfigMaps can only be built from the applied router Listener -this will apply to zookeeper as well..

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

Reviewer

• Code contains useful comments
• (Integration-)Test cases added
• 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

[adwk67]

--- PASS: kuttl (542.07s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/smoke_druid-37.0.0_zookeeper-3.9.5_hadoop-3.5.0_openshift-false (542.06s)
PASS

[siegfriedweber]

LGTM

[adwk67]

🟢 Openshift smoke test passes

--- PASS: kuttl (242.50s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/smoke_druid-37.0.0_zookeeper-3.9.5_hadoop-3.5.0_openshift-true (242.04s)
PASS