Test needed for speech/src/main/java/com/example/speech/InfiniteStreamRecognize.java

This sample is missing a test: [speech/src/main/java/com/example/speech/InfiniteStreamRecognize.java](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/main/speech/src/main/java/com/example/speech/InfiniteStreamRecognize.java)

The initial PR from years ago had no such requirement, which is no longer the case now.