[PM-37888] refactor: Read masterKeyWrappedUserKey from masterPasswordUnlock

[matt-livefront]

🎟️ Tracking

PM-37888

📔 Objective

Updates instances of AccountEncryptionKeys.encryptedUserKey to instead use UserDecryptionOptions.masterPasswordUnlock?.masterKeyEncryptedUserKey since these are all called for users with a master password. I've left AccountEncryptionKeys.encryptedUserKey for now, to be cleaned up in a separate PR.

• Switch unlockVaultFromLoginWithDevice, validatePassword, and KeyConnectorService.migrateUser to read the master-key-encrypted user key from UserDecryptionOptions.masterPasswordUnlock?.masterKeyEncryptedUserKey instead of AccountEncryptionKeys.encryptedUserKey
• Add setAccountMasterPasswordUnlock call in the V1 JIT and TDE paths of setMasterPassword (these paths previously never populated masterPasswordUnlock, so subsequent reads would return nil)
• Add setAccountMasterPasswordUnlock call in updateMasterPassword so the canonical source stays current after a password change
• Set encryptedUserKey: nil on all master-password-related setAccountEncryptionKeys calls — the value now lives exclusively in masterPasswordUnlock

[codecov]

Codecov Report

❌ Patch coverage is 99.18033% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (matt/PM-37886-key-connector-encrypted-user-key@934fd0a). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...Shared/Core/Auth/Repositories/AuthRepository.swift	95.83%	1 Missing ⚠️

Additional details and impacted files

@@                                Coverage Diff                                @@
##             matt/PM-37886-key-connector-encrypted-user-key    #2780   +/-   ##
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  Misses                                                    ?    20295           
  Partials                                                  ?        0           

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