Final migration updates - OBO tests and interactive flow fixes

- Updated OnBehalfOfTests.cs and LongRunningOnBehalfOfTests.cs to use multi-tenant app configuration
- Refined ConfidentialClientAuthorizationTests.cs and InteractiveFlowTests.NetFwk.cs
- Added pipeline log analysis file (60.txt) for debugging reference
- All AADSTS errors resolved through systematic multi-tenant app migration
- Verified test integrity preserved during lab infrastructure migration

Author: RyAuld