fix(test): Fix Iceberg test for OpenShift (cherry-picked) (#831)

fix(test): Iceberg/Minio on openshift (#827)

* fix(test): Iceberg/Minio on openshift

* linting

* more linting

* more linting

* linting, finally turned on pre-commit locally

Author: adwk67

tests/templates/kuttl/iceberg/20-assert.yaml

@@ -10,10 +10,3 @@ metadata:
 status:
   readyReplicas: 1
   replicas: 1
----
-apiVersion: batch/v1
-kind: Job
-metadata:
-  name: minio-post-job
-status:
-  succeeded: 1

tests/templates/kuttl/iceberg/20-install-minio.yaml

@@ -2,4 +2,4 @@
 apiVersion: kuttl.dev/v1beta1
 kind: TestStep
 commands:
-  - script: kubectl -n $NAMESPACE apply -f https://raw.githubusercontent.com/stackabletech/demos/refs/heads/release-25.3/stacks/_templates/minio-tls/rendered-chart.yaml
+  - script: kubectl -n $NAMESPACE apply -f 20_minio.yaml