[chore] restart job on failure (#26542)

**Description:**
Set up the telemetrygen job to restart on failure

**Link to tracking Issue:**
Fixes #24223


**Testing:**
See
#26530 (comment)
This investigation shows that the job fails to run sometimes. All other
deployments have a policy to restart on failure.

processor/k8sattributesprocessor/testdata/e2e/telemetrygen/job.yaml

@@ -26,4 +26,4 @@ spec:
 {{- end }}
         image: ghcr.io/open-telemetry/opentelemetry-collector-contrib/telemetrygen:latest
         name: telemetrygen
-      restartPolicy: Never
+      restartPolicy: OnFailure