feat: Extend rego rule coverage opa-authorizer

[adwk67]

Description

Part of stackabletech/hbase-opa-authorizer#8
Tested with images from stackabletech/docker-images#1446:

--- PASS: kuttl (446.09s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/opa_hbase-opa-2.6.3,oci.stackable.tech_sandbox_andrew_hbase_2.6.3-stackable0.0.0-dev_hdfs-latest-3.4.2_zookeeper-latest-3.9.4_krb5-1.21.1_opa-1.12.3_openshift-false (445.31s)
        --- PASS: kuttl/harness/opa_hbase-opa-2.6.4,oci.stackable.tech_sandbox_andrew_hbase_2.6.4-stackable0.0.0-dev_hdfs-latest-3.4.2_zookeeper-latest-3.9.4_krb5-1.21.1_opa-1.12.3_openshift-false (445.33s)
PASS

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

[razvan]

lgtm