Update standalone activity protos

[dandavison]

Update to latest protos from temporalio/api#640

Removes WorkerHeartbeat -- this has already been done in main (2403695) but we are not currently rebased on main.

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Note

Adds PollActivityExecution across server and client layers while removing DescribeActivityExecution and GetActivityExecutionResult; updates quotas/metadata/interceptors/mocks and bumps Temporal API dep.

• API surface:
  • Add PollActivityExecution to FrontendHandler and client wrappers (client_gen, metric_client_gen, retryable_client_gen), log tags, redirection maps, and tests.
  • Remove DescribeActivityExecution and GetActivityExecutionResult from clients, metrics, retryable clients, redirection maps, metadata, log tags, and mocks.
• Quotas/Priorities:
  • Classify PollActivityExecution as long-running and set priority (P4); update long-poll docs.
• Metadata:
  • Map PollActivityExecution as polling-capable in common/api/metadata.go.
• Server/frontend:
  • Drop worker heartbeat forwarding from PollWorkflowTaskQueue.
• Tooling/Deps:
  • Bump go.temporal.io/api dependency; clean getproto import map (remove enums/v1/id.proto).

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[bergundy]

Please note my comment below.

[bergundy]

I put this TODO here to make sure that we categorize long poll requests correctly. This request isn't always a long poll and needs some pre-processing to categorize.

[dandavison]

Ah I see the special treatment of GetWorkflowExecutionHistory now. Added a TODO back in.