Disable SQLServer on Windows test failure impacting master pipeline (#17770)

To be enabled once test failure is fixed

Author: vivek-datadog

sqlserver/tests/test_activity.py

@@ -209,6 +209,7 @@ def run_test_query(c, q):
 
 
 @pytest.mark.skipif(running_on_windows_ci() and SQLSERVER_MAJOR_VERSION == 2019, reason='Test flakes on this set up')
+@pytest.mark.skipif(running_on_windows_ci(), reason="Test disabled due to failure impacting master pipeline")
 def test_activity_nested_blocking_transactions(
     aggregator,
     instance_docker,