fix(sso): Add support for Microsoft Entra ID email verification claims

[bogdanmariusc10]

🔗 Related Issue

Closes #4391

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📝 Summary

Adds support for Microsoft Entra ID (Azure AD) email verification claims to fix authentication failures for Entra ID users in RC2+.

Problem:
Microsoft Entra ID does not follow the OIDC standard for email verification:

• Work/School accounts omit the email_verified claim entirely
• B2B/External ID scenarios use non-standard claims: verified_primary_email and verified_secondary_email

This caused authentication to fail for organizations using Entra ID SSO, blocking upgrades from RC1 to RC2+.

Solution:
Extended email verification logic to support Microsoft-specific claims while maintaining backward compatibility:

• Checks email_verified (standard OIDC) first
• Falls back to verified_primary_email (Microsoft B2B/External ID)
• Falls back to verified_secondary_email (Microsoft B2B/External ID)
• Pass-through when no claims present (supports work/school accounts)

Impact:

• Unblocks Entra ID users from upgrading to RC2+
• Maintains security by blocking login when claims explicitly indicate unverified email
• No breaking changes to existing SSO providers

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🏷️ Type of Change

• Bug fix
• Feature / Enhancement
• Documentation
• Refactor
• Chore (deps, CI, tooling)
• Other (describe below)

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🧪 Verification

Check	Command	Status
Lint suite	make lint	✅ Pass
Unit tests	make test	✅ Pass
Coverage ≥ 80%	make coverage	✅ Pass

Test Coverage:

• Added 10 new normalization tests for Microsoft claims
• Added 13 new verification logic tests
• All existing 318 tests continue to pass
• Total: 341 tests passing

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✅ Checklist

• Code formatted (make black isort pre-commit)
• Tests added/updated for changes
• Documentation updated (if applicable)
• No secrets or credentials committed

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📓 Notes

Implementation Details:

1. Modified _is_email_verified_claim()

   • Extended to check Microsoft-specific claims
   • Maintains claim precedence: email_verified > verified_primary_email > verified_secondary_email
   • Pass-through behavior when all claims absent

2. Modified _build_normalized_user_info()

   • Propagates Microsoft claims to normalized user info
   • Ensures verification status flows through authentication pipeline

3. Test Coverage:

   • test_sso_user_normalization.py - Normalization scenarios
   • test_sso_service.py - Claim verification logic

Claim Precedence Examples:

// Standard claim takes precedence
{
  "email_verified": true,
  "verified_primary_email": false
}
→ Result: Login allowed

// Primary takes precedence over secondary
{
  "verified_primary_email": true,
  "verified_secondary_email": false
}
→ Result: Login allowed

// No claims = pass-through (Entra work accounts)
{
  "email": "user@company.com"
}
→ Result: Login allowed

Security Considerations:

• Explicit false values block login (provider flagged as unverified)
• Maintains fail-closed behavior for security
• No changes to existing provider behavior