Fail to enable rollback if enable rollback times out

Make PackageManager send a ACTION_CANCEL_ENABLE_ROLLBACK intent to
RollbackManager. RollbackManager marks the relevant rollback as invalid.
Allow enable rollback to continue as usual, before making the rollback
available, RollbackManager checks whether it's valid. If it's not, the
rollback data is deleted.

Add a test case for expired rollback enabling attempt in RollbackTest.

Test: atest RollbackTest#testEnableRollbackTimeoutFailsRollback
Test: manual -
      * Set ENABLE_ROLLBACK_TIMEOUT_MILLIS to 1 ms using DeviceConfig
      * Install a mainline module with rollback enabled
      * adb shell dumpsys rollback
      * observe that no rollback was made available
Fixes: 131679409

Change-Id: Iaa4dbff002b820aff1fc3e1b985f129cf5ebe2e6