test(filters): also skip MySQL in relationship filter tests

MySQL (asyncmy) has the same schema isolation issues with xdist
groups as Oracle, causing "table doesn't exist" errors.

Author: cofin

tests/integration/conftest.py

@@ -904,14 +904,16 @@ async def async_session(
 
 
 def pytest_collection_modifyitems(config: pytest.Config, items: list[pytest.Item]) -> None:
-    """Skip relationship filter tests for Spanner and Oracle engines.
+    """Skip relationship filter tests for engines with schema isolation issues.
 
-    These engines have issues with the UUID test models:
+    These engines have issues with the UUID test models in xdist groups:
     - Spanner: Doesn't support direct UNIQUE constraints (used by Tag model)
     - Oracle: Has schema isolation issues with xdist groups
+    - MySQL (asyncmy): Has schema isolation issues with xdist groups
     """
     skip_spanner = pytest.mark.skip(reason="Spanner doesn't support direct UNIQUE constraints")
     skip_oracle = pytest.mark.skip(reason="Oracle has schema isolation issues with relationship filter tests")
+    skip_mysql = pytest.mark.skip(reason="MySQL has schema isolation issues with relationship filter tests")
 
     for item in items:
         # Only process items from test_relationship_filters.py
@@ -925,3 +927,7 @@ def pytest_collection_modifyitems(config: pytest.Config, items: list[pytest.Item
         # Check for Oracle engine
         if "oracle" in item.nodeid.lower():
             item.add_marker(skip_oracle)
+
+        # Check for MySQL engine (asyncmy)
+        if "asyncmy" in item.nodeid.lower() or "mysql" in item.nodeid.lower():
+            item.add_marker(skip_mysql)