Replace bash JavaTest.sh with mvn test (#7500)

* Start of mvn-ification of the test

* move to right locations

* Update the IO done in the test to read from resources / write to temp folders

* Add github workflow attempt to mvn test it instead of JavaTest.sh

* Pin the Kotlin benchmark's symlink for /java to the right location

* Inline equality assertions and format JavaTest.java

* fix android gradle source directory

Co-authored-by: Derek Bailey <derekbailey@google.com>

.github/workflows/build.yml

@@ -358,8 +358,8 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: test
-      working-directory: tests
-      run: bash JavaTest.sh
+      working-directory: java
+      run: mvn test
 
   build-kotlin-macos:
     name: Build Kotlin MacOS