fix: use bearerTokenFile instead of invalid authorization.credentialsFile

The ServiceMonitor CRD does not have a credentialsFile field under
authorization. Revert to bearerTokenFile which is a valid top-level
endpoint field (same as the chart's kubelet ServiceMonitor uses).

Co-Authored-By: Claude <noreply@anthropic.com>

Author: pedjak

testdata/prometheus/values.yaml

@@ -60,8 +60,7 @@ prometheus:
         matchLabels:
           app.kubernetes.io/name: operator-controller
       endpoints:
-        - authorization:
-            credentialsFile: /var/run/secrets/kubernetes.io/serviceaccount/token
+        - bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
           interval: 10s
           path: /metrics
           port: metrics
@@ -87,8 +86,7 @@ prometheus:
         matchLabels:
           app.kubernetes.io/name: catalogd
       endpoints:
-        - authorization:
-            credentialsFile: /var/run/secrets/kubernetes.io/serviceaccount/token
+        - bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
           interval: 10s
           path: /metrics
           port: metrics