[Bug]: Flaky Prism Runner unit tests in Java PreCommit

[Abacn]

What happened?

Flaky Prism Runner unit tests in Java PreCommit

Some recent added tests are flaky:

prismReportsPAssertFailure (org.apache.beam.runners.prism.PrismRunnerTest) failed

java.lang.AssertionError: unexpected exception type thrown; expected:<java.lang.AssertionError> but was:<org.apache.beam.vendor.grpc.v1p69p0.io.grpc.StatusRuntimeException>
	at org.junit.Assert.assertThrows(Assert.java:1020)
	at org.junit.Assert.assertThrows(Assert.java:981)
	at org.apache.beam.runners.prism.PrismRunnerTest.prismReportsPAssertFailure(PrismRunnerTest.java:105)
Caused by: org.apache.beam.vendor.grpc.v1p69p0.io.grpc.StatusRuntimeException: UNAVAILABLE: Network closed for unknown reason
	at app//org.apache.beam.vendor.grpc.v1p69p0.io.grpc.stub.ClientCalls.toStatusRuntimeException(ClientCalls.java:268)
	at app//org.apache.beam.vendor.grpc.v1p69p0.io.grpc.stub.ClientCalls.getUnchecked(ClientCalls.java:249)

windowing (org.apache.beam.runners.prism.PrismRunnerTest) failed

(same stack trace)

likely due to grpc channel not closed gracefully

e.g. https://github.com/apache/beam/runs/43846630757

Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

Issue Components

• Component: Python SDK
• Component: Java SDK
• Component: Go SDK
• Component: Typescript SDK
• Component: IO connector
• Component: Beam YAML
• Component: Beam examples
• Component: Beam playground
• Component: Beam katas
• Component: Website
• Component: Infrastructure
• Component: Spark Runner
• Component: Flink Runner
• Component: Samza Runner
• Component: Twister2 Runner
• Component: Hazelcast Jet Runner
• Component: Google Cloud Dataflow Runner

[shunping]

The actual error message that is useful is buried in the log. Thanks @lostluck for helping to uncover that.

panic: interface conversion: interface {} is nil, not []interface {}

goroutine 12 [running]:
github.com/apache/beam/sdks/v2/go/pkg/beam/runners/prism/internal.executePipeline({0x1c9e7b8, 0xc00004f950}, 0xc000430ff0, 0xc000368ea0)
	/runner/_work/beam/beam/sdks/go/pkg/beam/runners/prism/internal/execute.go:150 +0x35fe
github.com/apache/beam/sdks/v2/go/pkg/beam/runners/prism/internal.RunPipeline(0xc000368ea0)
	/runner/_work/beam/beam/sdks/go/pkg/beam/runners/prism/internal/execute.go:84 +0x47c
created by github.com/apache/beam/sdks/v2/go/pkg/beam/runners/prism/internal/jobservices.(*Server).Run in goroutine 11
	/runner/_work/beam/beam/sdks/go/pkg/beam/runners/prism/internal/jobservices/management.go:391 +0xd3

It is caused by my change in #35202. I am going to revert the "revert" and add a fix there and then cherry pick the fix in the release 2.66 branch. @Amar3tto