Migrate MediaMetadataRetrieverTest to JUnit4

Removed MediaMetadataRetrieverTest from MediaFrameworkUnitTestRunner

Bug: 305324235
Test: atest com.android.mediaframeworktest.unit.MediaMetadataRetrieverTest

Change-Id: I9bbd0a278c7c1b9e6cb14b3a79bde113837bd4c1
2 files changed