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

Before sending worker heartbeats, check DescribeNamespace for capabilities.worker_heartbeats; if unsupported or on error, warn and shut down the worker; tests updated accordingly.

• Worker heartbeats
  • Gate heartbeating by calling describe_namespace and requiring namespace_info.capabilities.worker_heartbeats == true.
  • On unsupported capability or namespace describe error: log warning and shutdown worker.
  • On record_worker_heartbeat Unimplemented error: shutdown worker.
• Tests
  • Update mocks to stub describe_namespace with worker_heartbeats: true.
  • Keep heartbeat assertions; expect 3 heartbeats under capability-enabled scenario.

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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