[SPARK-49395] Add 8081 port to Worker resource spec

[dongjoon-hyun]

What changes were proposed in this pull request?

This PR aims to add 8081 port to Worker resource spec.

Why are the changes needed?

Like Master's 8080 port, we can expose it for users.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Manual review.

$ gradle build buildDockerImage spark-operator-api:relocateGeneratedCRD -x check
$ helm install spark-kubernetes-operator -f build-tools/helm/spark-kubernetes-operator/values.yaml build-tools/helm/spark-kubernetes-operator/
$ kubectl apply -f examples/qa-cluster-with-one-worker.yaml
$ kubectl get pod -l spark-role=worker -oyaml | yq '.items[0].spec.containers[0].ports'
- containerPort: 8081
  name: web
  protocol: TCP

Was this patch authored or co-authored using generative AI tooling?

No.

[dongjoon-hyun]

Thank you, @viirya . Merged to main.