Add Gradle test event streaming protocol

[wenytang-ms]

Summary

This is PR 1 for #1817. It adds the protocol and server-side groundwork for a Gradle Tooling API test event stream without changing the current delegated test execution path.

• Add an opt-in stream_test_events flag to RunBuildRequest.
• Add GradleTestEvent to RunBuildReply for started/succeeded/failed/skipped/output events.
• Register Gradle Tooling API OperationType.TEST only when test event streaming is requested.
• Convert Gradle test progress/output events into normalized gRPC test events.
• Add a TaskServerClient.runBuild callback hook for future extension-side consumers.
• Cover opt-in test event streaming in GradleServerTest.

Validation

• ./gradlew.bat :extension:copyProtoJs :extension:copyProtoTs :gradle-server:test --quiet
• npm --prefix extension run compile:test -- --pretty false
• npm --prefix extension run lint:eslint -- --quiet
• ./gradlew.bat :gradle-server:spotlessCheck --quiet
• npx prettier --check src/client/TaskServerClient.ts

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[Copilot]

Pull request overview

Adds an opt-in gRPC protocol and server/client plumbing to stream Gradle Tooling API test events during delegated Gradle builds, without changing default execution behavior.

Changes:

• Extended the gRPC API with stream_test_events on RunBuildRequest and a new GradleTestEvent variant on RunBuildReply.
• Updated the Gradle server to register OperationType.TEST only when requested and to convert Tooling API test events into GradleTestEvent replies.
• Added an optional onTestEvent callback hook to the extension TaskServerClient.runBuild and added server-side tests covering the opt-in behavior.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
proto/gradle.proto	Adds the opt-in request flag and the GradleTestEvent message/stream reply variant.
gradle-server/src/main/java/com/github/badsyntax/gradle/handlers/RunBuildHandler.java	Routes test progress/output events into RunBuildReply.test_event and synchronizes response writes per request.
gradle-server/src/main/java/com/github/badsyntax/gradle/GradleBuildRunner.java	Conditionally registers OperationType.TEST based on the new opt-in flag.
gradle-server/src/test/java/com/github/badsyntax/gradle/GradleServerTest.java	Adds unit tests verifying OperationType.TEST registration and failure message propagation.
extension/src/client/TaskServerClient.ts	Adds optional onTestEvent callback and sets stream_test_events accordingly.

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