fix: openshift-gitops-operator-metrics-monitor ServiceMonitor is attempting to use a bearerTokenFile configuration in its endpoints definition

[akhilnittala]

What type of PR is this?

Uncomment only one /kind line, and delete the rest.
For example, > /kind bug would simply become: /kind bug

/kind bug

/kind cleanup
/kind failing-test
/kind enhancement
/kind documentation
/kind code-refactoring

What does this PR do / why we need it:
The latest Prometheus upgrade enforces stricter security practices by requiring the use of Secrets and ConfigMaps for bearer tokens and TLS CA configurations. However, our current implementation references bearerTokenFile and tlsConfig.caFile using absolute filesystem paths. This approach is no longer permitted, as Prometheus now prohibits direct filesystem access for these files. As a result, the Prometheus Operator logs show errors when it attempts to access these paths.
Have you updated the necessary documentation?

• Documentation update is required by this PR.
• Documentation has been updated.

Which issue(s) this PR fixes:
https://issues.redhat.com/browse/GITOPS-7992
Fixes #?
https://issues.redhat.com/browse/GITOPS-7992
Test acceptance criteria:

• Unit Test
• E2E Test

How to test changes / Special notes to the reviewer:

• install gitops operator on oc cluster

• make this change in cluster-monitoring-configmap like below

kind: ConfigMap
apiVersion: v1
metadata:
  name: cluster-monitoring-config
  namespace: openshift-monitoring
  uid: 8d390161-acc1-4409-809d-638359caeb40
  resourceVersion: '1966303'
  creationTimestamp: '2025-11-08T20:14:19Z'
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"v1","data":{"config.yaml":"prometheusK8s:\n  retention: 3d\n"},"kind":"ConfigMap","metadata":{"annotations":{},"name":"cluster-monitoring-config","namespace":"openshift-monitoring"}}
  managedFields:
    - manager: kubectl-client-side-apply
      operation: Update
      apiVersion: v1
      time: '2025-11-08T20:14:19Z'
      fieldsType: FieldsV1
      fieldsV1:
        'f:data': {}
        'f:metadata':
          'f:annotations':
            .: {}
            'f:kubectl.kubernetes.io/last-applied-configuration': {}
    - manager: Mozilla
      operation: Update
      apiVersion: v1
      time: '2025-11-13T08:48:04Z'
      fieldsType: FieldsV1
      fieldsV1:
        'f:data':
          'f:config.yaml': {}
data:
  config.yaml: |
    enableUserWorkload: true
    prometheusK8s:
      retention: 3d

• check prometheus operator pod logs using command "oc logs -f prometheus-operator-b6ccc8c9d-s86q4 -n openshift-user-workload-monitoring"

[openshift-ci]

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[openshift-ci]

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[svghadi]

/retest

[akhilnittala]

/retest-required

[anandf]

LGTM