fix: incorrect warnings for policies

[archit017]

This PR fixes incorrect warnings for policy assignments and definitions.

Changes

• Fixed schema mapper to properly handle policy-related warnings
• Removed unnecessary warning logic from policy assignment
• Cleaned up test assertions

Files Changed

• src/azure-policyassignment/lib/policy-assignment.ts - Removed incorrect warning logic
• src/azure-policyassignment/test/policy-assignment.spec.ts - Updated tests
• src/core-azure/lib/azapi/schema-mapper/schema-mapper.ts - Fixed schema mapping

Testing

All existing tests pass with the changes.