fix(migration): remap index_connection_id to project_connection_id for Azure AI Search (#807)

[Nithin (nithin42)]

Summary

Fixes #807

In Azure AI Studio (v1), the azure_ai_search tool stores its connection metadata under the key name index_connection_id. When migrating agents to Microsoft Foundry (v2), the v2 API requires project_connection_id.

Previously, remap_connection_ids_in_tool only checked if key == 'connection_id':, leaving index_connection_id untouched and unresolved in the migrated payload, causing the v2 API to reject creation with a 400 Bad Request error.

Changes

• Updated remap_connection_ids_in_tool() in migration/v1_to_v2_migration.py to match both connection_id and index_connection_id.
• Added unit tests in migration/test_migration_remapping.py covering single tool remapping, search index remapping, and end-to-end v1_assistant_to_v2_agent conversion.

Validation

• Ran Pytest: migration/test_migration_remapping.py (3 passed).
• Ran Black formatter on modified files.
• Validated end-to-end payload transformation against v1 search tool schemas.

[Nithin (nithin42)]

Hi Brandon Miller (@brandom-msft), tagging you for review on this migration fix for #807. Unit tests are included in migration/test_migration_remapping.py. Thanks!