feat(insights): add flag for insights region filter (#75997)

Author: DominikB2014

src/sentry/features/temporary.py

@@ -410,6 +410,8 @@ def register_temporary_features(manager: FeatureManager):
     manager.add("organizations:stacktrace-processing-caching", OrganizationFeature, FeatureHandlerStrategy.INTERNAL, api_expose=False)
     # Enable SAML2 Single-logout
     manager.add("organizations:sso-saml2-slo", OrganizationFeature, FeatureHandlerStrategy.OPTIONS, api_expose=False)
+    # Enable access to insights region filter in the UI
+    manager.add("organizations:insights-region-filter", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Show links and upsells to Insights modules
     manager.add("organizations:insights-entry-points", OrganizationFeature, FeatureHandlerStrategy.INTERNAL, api_expose=True)
     # Enable access to initial Insights modules (Queries, Requests, Vitals, App Starts, Page Loads, Resources)