add support for custom annotations on initialization Jobs

[lyuval-armosec]

Fixes #664

Motivation

When upgrading Pulsar via Helm, ArgoCD sync fails because it attempts
to update immutable fields on the initialization Jobs
(pulsar-cluster-initialize, bookkeeper-cluster-initialize,
pulsar-manager-cluster-initialize). This requires manually deleting
the Jobs before every upgrade, which is error-prone and breaks
GitOps automation.

Supporting custom annotations on these Jobs allows users to control
how their CD tooling handles them. For example:

• Setting argocd.argoproj.io/hook: Sync and
  argocd.argoproj.io/hook-delete-policy: BeforeHookCreation causes
  ArgoCD to automatically delete and recreate the Job on each sync.
• Setting argocd.argoproj.io/sync-options: Replace=true instructs
  ArgoCD to use kubectl replace instead of kubectl apply, avoiding
  the immutable field conflict entirely.

Modifications

• Added .Values.job.annotations (defaults to {}) in values.yaml
  under the existing job block.
• Applied the annotations to the metadata section of:
  • templates/pulsar-cluster-initialize.yaml
  • templates/bookkeeper-cluster-initialize.yaml
  • templates/pulsar-manager-cluster-initialize.yaml

[lhotari]

LGTM, thanks for the contribution!