Nuke Android/Unity apk flaky tests

[lucas-zimerman]

• Removed cache since it had a low impact on the time for setting up the devices + resulted in additional anomalies.
• Add retry step if the AVD setup or Unity initialization were flaky
  instrumentation tests uses: reactivecircus/android-emulator-runner@v2 failing - Error: Timeout waiting for emulator to boot. ReactiveCircus/android-emulator-runner#160
  https://forum.unity.com/threads/crash-on-immediate-restart-timeout-while-trying-to-pause-the-unity-engine-before-win-death.313408/
• fix ERROR | Running multiple emulators with the same AVD
• fix system alert blocking test.
• fix flaky tests due to emulator timeout.
• fix flaky tests due to the previous test app being installed.
• fix permission denied to execute the smoke test.
• limit the number of parallel cloud jobs to not limit other environments.
• reduced the number of devices tested from 11 to 4.
• Do not invalidate the long-lasting tests due to a flaky setup on a single device.

#skip-changelog.