test: Resolve silent mcp test (#1907)

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## Description
Resolve issue with silent MCP test

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## Summary by CodeRabbit

* **Tests**
* Modified test failure handling to enforce zero failures during test
runs by aborting upon test failures.

<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>

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cognee-mcp/src/test_client.py

@@ -627,8 +627,7 @@ class TestModel:
         print(f"Failed: {failed}")
         print(f"Success Rate: {(passed / total_tests * 100):.1f}%")
 
-        if failed > 0:
-            print(f"\n ⚠️ {failed} test(s) failed - review results above for details")
+        assert failed == 0, f"\n ⚠️ {failed} test(s) failed - review results above for details"
 
 
 async def main():