Auto cancel Postgres checks after tests (DataDog#21500)

* Auto cancel Postgres checks after tests

* Lint

* Fix

* Lint

* Revert

Author: sethsamuel

postgres/tests/conftest.py

@@ -82,13 +82,19 @@ def check():
     return c
 
 
-@pytest.fixture
+@pytest.fixture(scope="function")
 def integration_check() -> Callable[[dict, Optional[dict]], PostgreSql]:
+    c = None
+
     def _check(instance: dict, init_config: dict = None):
+        nonlocal c
         c = PostgreSql('postgres', init_config or {}, [instance])
         return c
 
-    return _check
+    yield _check
+
+    if c:
+        c.cancel()
 
 
 @pytest.fixture