KAFKA-19807: Add RPC-level integration tests for StreamsGroupHeartbeat [1/2] (#20757)

## What
Ticket: https://issues.apache.org/jira/browse/KAFKA-19807

Add integration test similar to `ShareGroupHeartbeatRequestTest` and
`ConsumerGroupHeartbeatRequestTest` for `StreamsGroupHeartbeat`

Reviewers: Lucas Brutschy <[email protected]>

---------

Co-authored-by: Lucas Brutschy <[email protected]>
Co-authored-by: Copilot <[email protected]>

Author: 3 people

core/src/test/scala/unit/kafka/server/GroupCoordinatorBaseRequestTest.scala

@@ -880,6 +880,7 @@ class GroupCoordinatorBaseRequestTest(cluster: ClusterInstance) {
     warmupTasks: List[StreamsGroupHeartbeatRequestData.TaskIds] = null,
     topology: StreamsGroupHeartbeatRequestData.Topology = null,
     expectedError: Errors = Errors.NONE,
+    processId: String = null,
     version: Short = ApiKeys.STREAMS_GROUP_HEARTBEAT.latestVersion(isUnstableApiEnabled)
   ): StreamsGroupHeartbeatResponseData = {
     val streamsGroupHeartbeatRequest = new StreamsGroupHeartbeatRequest.Builder(
@@ -892,6 +893,7 @@ class GroupCoordinatorBaseRequestTest(cluster: ClusterInstance) {
         .setStandbyTasks(standbyTasks.asJava)
         .setWarmupTasks(warmupTasks.asJava)
         .setTopology(topology)
+        .setProcessId(processId)
     ).build(version)
 
     // Send the request until receiving a successful response. There is a delay