* refactor triggerChangedPasswordNotification logic
* improve triggerChangedPasswordNotification and test coverage to handle scenarios more comprehensively
* restore triggerChangedPasswordNotification logic and move new logic and testing to triggerCipherNotification
* add branching qualification logic for cipher notifications
* add and implement undetermined-cipher-scenario-logic feature flag
* add optional chaining to username comparison of existing login ciphers
* cleanup
* update tests
* prefer explicit length comparisons