Worker heartbeat: Remove heartbeat from non-nexus polling (#633)

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<!-- Describe what has changed in this PR -->
**What changed?**
Removed the `worker_heartbeat` field from non-nexus calls

<!-- Tell your future self why have you made these changes -->
**Why?**
We only want `worker_heartbeat` info sent on nexus polls, worker
shutdown, and dedicated worker heartbeat requests.


<!-- Are there any breaking changes on binary or code level? -->
**Breaking changes**
Breaking change for a WIP feature, should have no effect. Also tried
grepping for this field in server and didn't find it used anywhere.

<!-- If this breaks the Server, please provide the Server PR to merge
right after this PR was merged. -->
**Server PR**

Author: yuandrew

buf.yaml

@@ -14,6 +14,7 @@ breaking:
   ignore:
     - google
     # TODO (yuandrew): remove this. Added for "heartbeat" changes
+    - temporal/api/workflowservice/v1/request_response.proto
     - temporal/api/worker/v1/message.proto
 lint:
   use:

temporal/api/workflowservice/v1/request_response.proto

@@ -269,9 +269,6 @@ message PollWorkflowTaskQueueRequest {
     // Worker deployment options that user has set in the worker.
     // Experimental. Worker Deployments are experimental and might significantly change in the future.
     temporal.api.deployment.v1.WorkerDeploymentOptions deployment_options = 6;
-
-    // Worker info to be sent to the server.
-    temporal.api.worker.v1.WorkerHeartbeat worker_heartbeat = 7;
 }
 
 message PollWorkflowTaskQueueResponse {
@@ -443,10 +440,6 @@ message PollActivityTaskQueueRequest {
     temporal.api.common.v1.WorkerVersionCapabilities worker_version_capabilities = 5 [deprecated = true];
     // Worker deployment options that user has set in the worker.
     temporal.api.deployment.v1.WorkerDeploymentOptions deployment_options = 6;
-
-    // Worker info to be sent to the server.
-    temporal.api.worker.v1.WorkerHeartbeat worker_heartbeat = 7;
-
 }
 
 message PollActivityTaskQueueResponse {