[piav2] Cancel the install session while finishing the app

If an installation needs to be aborted, set permissionsResult for
the session explicitly. This will ensure session owners get the correct
install result on cancellation / failure.

Test: atest CtsPackageInstallerCUJTestCases:InstallationViaSessionTest
Bug: 358437169
Change-Id: I42a3571af2c31cda5cb8dd42cdefdb3e0233691e