fix(test): Update status enum values to match Google Interactions OpenAPI spec (#22061)

Google's Interactions API spec changed the status enum:
- Values are now lowercase (was uppercase)
- 'UNSPECIFIED' value was removed

Updated test to match the current spec from:
https://ai.google.dev/static/api/interactions.openapi.json

tests/test_litellm/interactions/test_openapi_compliance.py

@@ -147,7 +147,8 @@ class TestResponseCompliance:
         """Verify status enum values match spec."""
         schema = spec_dict["components"]["schemas"]["CreateModelInteractionParams"]
         status_prop = schema["properties"]["status"]
-        expected_statuses = ["UNSPECIFIED", "IN_PROGRESS", "REQUIRES_ACTION", "COMPLETED", "FAILED", "CANCELLED", "INCOMPLETE"]
+        # Google Interactions API uses lowercase status values (updated Feb 2026)
+        expected_statuses = ["in_progress", "requires_action", "completed", "failed", "cancelled", "incomplete"]
         assert status_prop["enum"] == expected_statuses
         print(f"✓ Status enum values: {expected_statuses}")