fix: use ReadWriteOnce for MLflow PVC storage

EBS-backed clusters (AWS/ROSA) don't support ReadWriteMany. Since
replicas is set to 1, ReadWriteOnce is sufficient.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Ambient Code Bot

components/manifests/components/openshift-ai/mlflow.yaml

@@ -24,7 +24,7 @@ spec:
   # and inject credentials via envFrom.
   storage:
     accessModes:
-    - ReadWriteMany
+    - ReadWriteOnce
     resources:
       requests:
         storage: 10Gi