Gate worker heartbeating behind namespace capabilities

[yuandrew]

NOTE: This PR needs a server patch release that includes sending this information in namespace capabilities.

What was changed

Call DescribeNamespace and gate worker heartbeating from the worker_heartbeat Capability

Why?

So older servers without this support don't get pinged and emit server error logs for unimplemented

Checklist

1. Closes

2. How was this tested:

3. Any docs updates needed?

---

Note

Gate worker heartbeating via DescribeNamespace capabilities; shut down worker if unsupported/unimplemented; update tests and CLI override.

• Core/Worker Heartbeats:
  • Call describe_namespace at startup and proceed only if namespace_info.capabilities.worker_heartbeats is true; otherwise log warning and shut down worker.
  • On record_worker_heartbeat returning UNIMPLEMENTED, shut down worker before exiting.
• Tests:
  • Update heartbeat test to mock DescribeNamespace with worker_heartbeats=true; adjust imports accordingly.
• Tooling:
  • Set CLI_VERSION_OVERRIDE to server-1-29-1 in .cargo/config.toml.

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[Sushisource]

This makes sense to me but looks like you'll need to update a mocks etc to fix tests

[yuandrew]

Added mock, need to wait for next server release for integration tests to pass, now that we're disabling heartbeating for from this feature that is added in the next release