ref(flag): Add flag for performance landing widgets (#26168)

* ref(flag): Add flag for performance landing widgets

A flag we can put potential improvements to the landing page behind.

Author: k-fish

src/sentry/conf/server.py

@@ -951,6 +951,8 @@ def create_partitioned_queues(name):
     "organizations:performance-ops-breakdown": False,
     # Enable views for tag explorer
     "organizations:performance-tag-explorer": False,
+    # Enable landing improvements for performance
+    "organizations:performance-landing-widgets": False,
     # Enable the new Related Events feature
     "organizations:related-events": False,
     # Enable usage of external relays, for use with Relay. See

src/sentry/features/__init__.py

@@ -132,6 +132,8 @@
 default_manager.add(
     "organizations:project-transaction-threshold", OrganizationFeature, True  # NOQA
 )
+default_manager.add("organizations:performance-landing-widgets", OrganizationFeature, True)  # NOQA
+
 # NOTE: Don't add features down here! Add them to their specific group and sort
 #       them alphabetically! The order features are registered is not important.