chore: Create a feature-flag for an experimental toolbar feature (#73246)

src/sentry/features/temporary.py

@@ -79,6 +79,8 @@ def register_temporary_features(manager: FeatureManager):
     # Enable release health widget in dashboards
     manager.add("organizations:dashboards-rh-widget", OrganizationFeature, FeatureHandlerStrategy.REMOTE)
     manager.add("organizations:dashboards-span-metrics", OrganizationFeature, FeatureHandlerStrategy.OPTIONS)
+    # Enable the dev toolbar PoC code for employees
+    manager.add("organizations:devtoolbar", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, default=False)
     # Delightful Developer Metrics (DDM):
     # Enables experimental WIP custom metrics related features
     manager.add("organizations:custom-metrics-experimental", OrganizationFeature, FeatureHandlerStrategy.REMOTE)