Merge changes from topic "locksettings-aosp" into main

* changes:
  LockSettingsService: remove obsolete EventLog logging
  Ensure that LockSettingsService waits for gatekeeperd to be ready
  Make PasswordMetrics#computeForPasswordOrPin() private
  Remove PasswordMetrics#validatePassword()
  Enforce minimum pattern length in PasswordMetrics
  Properly validate credential in setLock(int, byte[], int, byte[])
  DPMS: allow getPasswordMinimumMetrics() to anyone who can set LSKF
  Allow constructing a PIN LockscreenCredential with mInvalidChars
  Make LockSettingsService enforce basic requirements for new credentials
  Add and use PasswordMetrics#validateCredential()
  Make LockscreenCredential remember whether it has invalid chars
  Allow LockscreenCredential to represent any proposed credential
  Convert LockscreenCredentialTest to JUnit4
  Handle incomplete protectors in destroyAllWeakTokenBasedProtectors()
  LockSettingsService: remove redundant calls to verifyChallenge()