Add a level to commit all available rollbacks

There have been a few issues (like b/244419269) which led to devices
performing factory reset step, but could have been prevented
if we committed all available rollbacks. Thus adding the step to rollback all available rollbacks as preventive step to reduce the cases where device goes into Factory Reset mode.
Also adding few more impact levels in Package Watchdog to granularly control the execution of various levels by package health observers.

Test: atest RollbackPackageHealthObserver
Bug: b/264997660

Change-Id: Ifbee3a67fe69aa9c54080e498f9afa891b6be8dc
Merged-In: Ifbee3a67fe69aa9c54080e498f9afa891b6be8dc