Mark WASB blob tests as DB tests (#38963)

The WASB blob tests started to fail intermittently after retries were
implemented in #38910. Without understanding all the details, it
seems that the async tests run in xdist mode of tests suffer from the
bug of pytest-xdist - because the thread that runs some of the tests
is not main and it likely interferes with signals handling and is
likely an incarnation of
pytest-dev/pytest-xdist#620
(which still needs to be solved in pytest-xdist)

Since those two tests that keeps on failing intermittently and the other
tests have been marked as db_test - likely for the same reason, we
should simply mark all the module as db_test to avoid the interference.

tests/providers/microsoft/azure/triggers/test_wasb.py

@@ -35,6 +35,8 @@
 TEST_WASB_CONN_ID = "wasb_default"
 POKE_INTERVAL = 5.0
 
+pytestmark = pytest.mark.db_test
+
 
 class TestWasbBlobSensorTrigger:
     TRIGGER = WasbBlobSensorTrigger(
@@ -78,7 +80,6 @@ async def test_running(self, mock_check_for_blob, blob_exists):
         assert task.done() is False
         asyncio.get_event_loop().stop()
 
-    @pytest.mark.db_test
     @pytest.mark.asyncio
     @mock.patch("airflow.providers.microsoft.azure.hooks.wasb.WasbAsyncHook.check_for_blob_async")
     async def test_success(self, mock_check_for_blob):
@@ -115,7 +116,6 @@ async def test_waiting_for_blob(self, mock_check_for_blob, caplog):
             assert message in caplog.text
         asyncio.get_event_loop().stop()
 
-    @pytest.mark.db_test
     @pytest.mark.asyncio
     @mock.patch("airflow.providers.microsoft.azure.hooks.wasb.WasbAsyncHook.check_for_blob_async")
     async def test_trigger_exception(self, mock_check_for_blob):
@@ -170,7 +170,6 @@ async def test_running(self, mock_check_for_prefix, prefix_exists):
         assert task.done() is False
         asyncio.get_event_loop().stop()
 
-    @pytest.mark.db_test
     @pytest.mark.asyncio
     @mock.patch("airflow.providers.microsoft.azure.hooks.wasb.WasbAsyncHook.check_for_prefix_async")
     async def test_success(self, mock_check_for_prefix):
@@ -208,7 +207,6 @@ async def test_waiting_for_blob(self, mock_check_for_prefix):
             mock_log_info.assert_called_once_with(message)
         asyncio.get_event_loop().stop()
 
-    @pytest.mark.db_test
     @pytest.mark.asyncio
     @mock.patch("airflow.providers.microsoft.azure.hooks.wasb.WasbAsyncHook.check_for_prefix_async")
     async def test_trigger_exception(self, mock_check_for_prefix):