mds: run on lakefs-enterprise image via lakefs mds run

[N-o-Z]

Closes #396

Summary

• Switches the MDS deployment to the treeverse/lakefs-enterprise image and invokes it as lakefs mds run, replacing the legacy standalone Python MDS container.
• New mds.repository / mds.tag helpers: mds.image.repository defaults to treeverse/lakefs-enterprise, mds.image.tag falls back to image.enterprise.tag so the MDS pod tracks the lakeFS server version by default.
• New mds.command and mds.args values let users override the container ENTRYPOINT and arguments. Default args: ["mds", "run", "--config", "/app/config.yaml"] overrides the lakeFS image's ["run"] CMD.
• Drops the Python-specific PYTHONPATH env workaround that was tied to the old MDS image.
• Refreshes the example mds.config to match the lakeFS Enterprise metadata_search schema.
• Bumps chart to 1.10.0 with CHANGELOG entry.

Rollback (no chart edits required)

mds:
  image:
    repository: treeverse/mds
    tag: "0.2.1"
  args: ["--config", "/app/config.yaml"]
  extraEnvVars:
    - name: PYTHONPATH
      value: /home/arktika/.local/lib/python3.13/site-packages
  config:
    lakefs: { endpoint: ..., access_key_id: ..., secret_access_key: ... }
    metadata_settings: { since: ..., max_commits: 100 }
    repositories: { ... }

Test plan

• helm lint charts/lakefs
• helm template charts/lakefs --set mds.enabled=true renders the deployment with image: treeverse/lakefs-enterprise:<image.enterprise.tag> and args: [mds, run, --config, /app/config.yaml], no command: field, no PYTHONPATH env.
• helm template charts/lakefs --set mds.enabled=true --set mds.image.repository=treeverse/mds --set mds.image.tag=0.2.1 --set 'mds.args={--config,/app/config.yaml}' renders the legacy image with the legacy args.
• Deploy to a cluster with a valid enterprise license and verify the MDS pod becomes ready and the /health endpoint responds.

https://claude.ai/code/session_01K7WeQ1doQLnWsXY2EEvGNR

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LGTM