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

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
• 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

[adwk67]

This - build_discovery_config_map - is a build step, but it cannot live in the "actual" step (due to dependencies) but neither is it really part of apply, so I've left it here.

[adwk67]

This will be covered by our TODO item:

Address the race condition for discovery config maps: see HDFS, Hive, Kafka

[adwk67]

Things would be brittle if we didn't first check we have actually retrieved everthing that KubernetesResources holds.

[adwk67]

Also added to the PRs for Druid, HBase.

[adwk67]

--- PASS: kuttl (741.03s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/smoke_hadoop-3.5.0_zookeeper-3.9.4_zookeeper-latest-3.9.5_number-of-datanodes-2_datanode-pvcs-2hdd-1ssd_listener-class-cluster-internal_openshift-false (327.98s)
        --- PASS: kuttl/harness/smoke_hadoop-3.5.0_zookeeper-3.9.4_zookeeper-latest-3.9.5_number-of-datanodes-2_datanode-pvcs-2hdd-1ssd_listener-class-external-unstable_openshift-false (159.48s)
        --- PASS: kuttl/harness/smoke_hadoop-3.5.0_zookeeper-3.9.5_zookeeper-latest-3.9.5_number-of-datanodes-2_datanode-pvcs-2hdd-1ssd_listener-class-external-unstable_openshift-false (184.41s)
        --- PASS: kuttl/harness/smoke_hadoop-3.5.0_zookeeper-3.9.5_zookeeper-latest-3.9.5_number-of-datanodes-2_datanode-pvcs-2hdd-1ssd_listener-class-cluster-internal_openshift-false (741.02s)
PASS