chore: runAsNonRoot and fix empty CRD fields

[sbernauer]

Description

Part of stackabletech/issues#876

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

[xeniape]

--- PASS: kuttl (461.11s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/logging_opa-1.12.3_openshift-false (109.29s)
        --- PASS: kuttl/harness/keycloak-user-info_opa-latest-1.16.2_keycloak-23.0.1_openshift-false (150.51s)
        --- PASS: kuttl/harness/smoke_opa-1.16.2_openshift-false_use-tls-true (60.92s)
        --- PASS: kuttl/harness/resources_opa-latest-1.16.2_openshift-false (19.83s)
        --- PASS: kuttl/harness/aas-user-info_opa-latest-1.16.2_openshift-false (88.14s)
        --- PASS: kuttl/harness/openldap-user-info_opa-latest-1.16.2_openshift-false (77.43s)
        --- PASS: kuttl/harness/cluster-operation_opa-latest-1.16.2_openshift-false (35.99s)
        --- PASS: kuttl/harness/smoke_opa-1.12.3_openshift-false_use-tls-false (58.41s)
        --- PASS: kuttl/harness/smoke_opa-1.16.2_openshift-false_use-tls-false (58.56s)
        --- PASS: kuttl/harness/smoke_opa-1.12.3_openshift-false_use-tls-true (61.68s)
        --- PASS: kuttl/harness/config-overrides_opa-latest-1.16.2_openshift-false (59.88s)
        --- PASS: kuttl/harness/logging_opa-1.16.2_openshift-false (73.54s)
PASS