fix(tests): openshift tweaks

[razvan]

Description

After switching to stand-alone kcat, the upgrade test finally succeeded on OpenShift 4.15

--- PASS: kuttl (104.91s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/upgrade_zookeeper-3.8.3_upgrade_old-3.5.2_upgrade_new-3.6.1_use-client-tls-true_use-client-auth-tls-true_openshift-true (104.67s)

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
- [x] Changes are OpenShift compatible
- [x] CRD changes approved
- [x] CRD documentation for all fields, following the [style guide](https://docs.stackable.tech/home/nightly/contributor/docs-style-guide).
- [x] Helm chart can be installed and deployed operator works
- [x] Integration tests passed (for non trivial changes)
- [ ] Changes need to be "offline" compatible

# Reviewer
- [x] Code contains useful comments
- [x] (Integration-)Test cases added
- [x] Changelog updated
- [x] 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
- [ ] [Roadmap](https://github.com/orgs/stackabletech/projects/25/views/1) has been updated

[razvan]

CI: https://ci.stackable.tech/view/02%20Operator%20Tests%20(custom)/job/kafka-operator-it-custom/58/