fix: make RunSQLFromFile run the sql provided

[davecoates]

No description provided.

[EmilyS-AS]

I got django.db.utils.OperationalError: (1065, 'Query was empty') when trying to run tests locally

I tried this before as well, I was only able to fix it by doing

def _run_sql(self, schema_editor, sqls):
    path = Path(apps.get_app_config(self.app_name).path, 'migrations', self.filename)
    sql = path.read_text()

    statements = sqlparse.split(sql)

    for statement in statements:
        schema_editor.execute(statement)