Add unit tests for DurableTaskGrpcClientFactory

[Copilot]

Issue describing the changes in this PR

resolves #254

Pull request checklist

• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes are added to the CHANGELOG.md
• I have added all required tests (Unit tests, E2E tests)

Additional information

Added unit tests validating DurableTaskGrpcClientFactory singleton behavior:

• Same port returns same client instance
• Different ports return different client instances
• Multiple concurrent ports maintain correct mappings

This PR only adds the test file and does not modify any production code.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

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[sophiatev]

@copilot remove the changes to the proto file and DurableTaskGrpcClient.java from this PR. Only keep the new test file.

[Copilot]

@copilot remove the changes to the proto file and DurableTaskGrpcClient.java from this PR. Only keep the new test file.

Removed changes to DurableTaskGrpcClient.java and orchestrator_service.proto in commit e87e98f. Only the test file DurableTaskGrpcClientFactoryTest.java remains.

Note: The base branch has a compilation error where defaultVersion is not initialized in the DurableTaskGrpcClient(int port) constructor. This was one of the changes I previously made and has now been reverted per your request.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• rt.services.visualstudio.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.lang.invoke=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.prefs/java.util.prefs=ALL-UNNAMED --add-opens java.prefs/java.util.prefs=ALL-UNNAMED --add-opens java.base/java.nio.charset=ALL-UNNAMED --add-opens java.base/java.net=ALL-UNNAMED --add-opens java.base/java.util.concurrent.atomic=ALL-UNNAMED -XX:MaxMetaspaceSize=256m (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)