Remove RemovedIn20Warning from config

This does not exist in SQLAlchemy 2.0

lib/galaxy/config/__init__.py

@@ -742,7 +742,6 @@ class GalaxyAppConfiguration(BaseAppConfiguration, CommonConfigurationMixin):
     def __init__(self, **kwargs):
         super().__init__(**kwargs)
         self._override_tempdir(kwargs)
-        self._configure_sqlalchemy20_warnings(kwargs)
         self._process_config(kwargs)
         self._set_dependent_defaults()
 
@@ -759,36 +758,6 @@ def _set_dependent_defaults(self):
                     f"{dependent_config_param}, {config_param}"
                 )
 
-    def _configure_sqlalchemy20_warnings(self, kwargs):
-        """
-        This method should be deleted after migration to SQLAlchemy 2.0 is complete.
-        To enable warnings, set `GALAXY_CONFIG_SQLALCHEMY_WARN_20=1`,
-        """
-        warn = string_as_bool(kwargs.get("sqlalchemy_warn_20", False))
-        if warn:
-            import sqlalchemy
-
-            sqlalchemy.util.deprecations.SQLALCHEMY_WARN_20 = True
-            self._setup_sqlalchemy20_warnings_filters()
-
-    def _setup_sqlalchemy20_warnings_filters(self):
-        import warnings
-
-        from sqlalchemy.exc import RemovedIn20Warning
-
-        # Always display RemovedIn20Warning warnings.
-        warnings.filterwarnings("always", category=RemovedIn20Warning)
-        # Optionally, enable filters for specific warnings (raise error, or log, etc.)
-        # messages = [
-        #     r"replace with warning text to match",
-        # ]
-        # for msg in messages:
-        #     warnings.filterwarnings('error', message=msg, category=RemovedIn20Warning)
-        #
-        # See documentation:
-        # https://docs.python.org/3.7/library/warnings.html#the-warnings-filter
-        # https://docs.sqlalchemy.org/en/14/changelog/migration_20.html#migration-to-2-0-step-three-resolve-all-removedin20warnings
-
     def _load_schema(self):
         return AppSchema(GALAXY_CONFIG_SCHEMA_PATH, GALAXY_APP_NAME)