Clean up staged session data on validation failure

Bug: 173132101
Test: atest StagedInstallInternalTest#testStagedInstallationShouldCleanUpOnValidationFailure
Test: atest StagedInstallInternalTest#testStagedInstallationShouldCleanUpOnValidationFailureMultiPackage
Change-Id: Idd6597cd0d2dda34a8a7626b585401eeee39c31f
3 files changed