chore: remove PUBLIC_ROLE_LIKE_GAMMA deprecated config key

UPDATING.md

@@ -29,6 +29,7 @@ assists people when migrating to a new version.
 
 ### Breaking Changes
 
+- [19274](https://github.com/apache/superset/pull/19274): The `PUBLIC_ROLE_LIKE_GAMMA` config key has been removed, set `PUBLIC_ROLE_LIKE` = "Gamma" to have the same functionality.
 - [19273](https://github.com/apache/superset/pull/19273): The `SUPERSET_CELERY_WORKERS` and `SUPERSET_WORKERS` config keys has been removed. Configure celery directly using `CELERY_CONFIG` on Superset
 - [19231](https://github.com/apache/superset/pull/19231): The `ENABLE_REACT_CRUD_VIEWS` feature flag has been removed (permanently enabled). Any deployments which had set this flag to false will need to verify that the React views support their use case.
 - [17556](https://github.com/apache/superset/pull/17556): Bumps mysqlclient from v1 to v2

superset/security/manager.py

@@ -726,12 +726,6 @@ def sync_role_definitions(self) -> None:
                 self.auth_role_public,
                 merge=True,
             )
-        if current_app.config.get("PUBLIC_ROLE_LIKE_GAMMA", False):
-            logger.warning(
-                "The config `PUBLIC_ROLE_LIKE_GAMMA` is deprecated and will be removed "
-                "in Superset 1.0. Please use `PUBLIC_ROLE_LIKE` instead."
-            )
-            self.copy_role("Gamma", self.auth_role_public, merge=True)
 
         self.create_missing_perms()
 

superset/views/core.py

@@ -2792,7 +2792,7 @@ def show_traceback(self) -> FlaskResponse:  # pylint: disable=no-self-use
     def welcome(self) -> FlaskResponse:
         """Personalized welcome page"""
         if not g.user or not g.user.get_id():
-            if conf.get("PUBLIC_ROLE_LIKE_GAMMA", False) or conf["PUBLIC_ROLE_LIKE"]:
+            if conf["PUBLIC_ROLE_LIKE"]:
                 return self.render_template("superset/public_welcome.html")
             return redirect(appbuilder.get_url_for_login)