Avoid adb root during TranscodeTest

shell uid cannot setprops without root, so we set the
transcode_compat_manifest with the package requiring transcoding
instead and the MediaProvider picks this change.

Also Ignored stress tests that were causing some flakes on cuttlefish

Test: adb unroot && atest TranscodeTest
Bug: 183999755

Change-Id: Iaed47fd764a74f82365812dac3f007be672fcbf6
3 files changed