MAESTRO: align tests API response with selector

backend/app/schemas/tests.py

@@ -1,7 +1,16 @@
 from __future__ import annotations
 
+from pydantic import BaseModel, ConfigDict, Field
+
 from app.engine.models import Test
 
 
 class TestResponse(Test):
     pass
+
+
+class TestListResponse(BaseModel):
+    model_config = ConfigDict(populate_by_name=True)
+
+    tests: list[TestResponse]
+    total_count: int = Field(alias="totalCount")