transcoding: Add tests for uncovered apis: getSupportedHdrTypes() getSupportedVideoMimeTypes() getUnsupportedHdrTypes() getUnsupportedVideoMimeTypes() Bug: 169965769 Test: atest CtsMediaTranscodingTestCases:MediaTranscodeManagerTest Change-Id: Id0b4f6bbf5b556f2c76739f40081c8d31e834df2