feat: add namespace metadata labels with pr info

[vigneshrajsb]

What changed

• add namespace labels for PR metadata during namespace create and update
• split repository metadata into lfc/org and lfc/repo labels
• add focused coverage for namespace metadata behavior using generic test data

Why

• make it easier to query and debug Lifecycle namespaces directly with label selectors

Before / After

Before:

metadata:
  labels:
    app.kubernetes.io/managed-by: lifecycle
    lfc/uuid: <build-uuid>
    lfc/type: <static|ephemeral>
    lfc/ttl-enable: <true|false>
    # and TTL timestamp labels when enabled

After:

metadata:
  labels:
    app.kubernetes.io/managed-by: lifecycle
    lfc/uuid: <build-uuid>
    lfc/type: <static|ephemeral>
    lfc/ttl-enable: <true|false>
    lfc/org: <repo-owner>
    lfc/repo: <repo-name>
    lfc/pull-request: <pr-number>
    lfc/author: <github-login>
    # and TTL timestamp labels when enabled

Impact

• namespaces created or updated by Lifecycle now include lfc/org, lfc/repo, lfc/pull-request, and lfc/author

Validation

• pnpm exec jest src/server/lib/__tests__/namespaceMetadata.test.ts --runInBand
• pnpm exec jest src/server/services/__tests__/build.test.ts --runInBand