Tests: Remove tests related to database migrations

tests/test_tracking.py

@@ -3358,21 +3358,6 @@ def test_log_inputs_with_duplicates_in_single_request(self):
         )
 
 
-class TestSqlAlchemyStoreMigratedDB(TestSqlAlchemyStore):
-    """
-    Test case where user has an existing DB with schema generated before MLflow 1.0,
-    then migrates their DB.
-    """
-
-    def setUp(self):
-        super()._setup_db_uri()
-        engine = sqlalchemy.create_engine(self.db_url)
-        InitialBase.metadata.create_all(engine)
-        engine.dispose()
-        invoke_cli_runner(mlflow.db.commands, ["upgrade", self.db_url])
-        self.store = SqlAlchemyStore(self.db_url, ARTIFACT_URI)
-
-
 class TextClauseMatcher:
     def __init__(self, text):
         self.text = text