Extending BazelTestRunner to Add Custom Metadata to JUnit XML

I've been working on extending the BazelTestRunner to add custom metadata (properties) to the JUnit XML generated by Stripe's Java tests, but I'm hitting a roadblock.

The most promising approach I've found involves using the TestPropertyExporter singleton instance, but I'm uncertain about how it's meant to be used. Additionally, when looking into the Bazel codebase, I noticed that the method testEmittedProperty() in TestSuiteModel.java seems related, but it isn't being called anywhere.

Any advice or alternative suggestions would be appreciated.

先追蹤 BazelTestRunner 和 TestPropertyExporter 單例，接著檢查 TestSuiteModel.java 以及未使用的 testEmittedProperty() 方法。判定自訂屬性應如何流入 JUnit XML，並找出相關的 Java 測試涵蓋範圍。完成的標準是 Stripe 的 Java 測試輸出包含所要求的中繼資料，並能可靠地驗證這些資料。

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