ref(dashboards): Removes backend widget builder feature flags (#38650)

Removes widget builder flags from backend

src/sentry/conf/server.py

@@ -1027,12 +1027,6 @@ SENTRY_FEATURES = {
     "organizations:metrics": False,
     # Enable metric alert charts in email/slack
     "organizations:metric-alert-chartcuterie": False,
-    # Enable the new widget builder experience on Dashboards
-    "organizations:new-widget-builder-experience": False,
-    # Enable the new widget builder experience "design" on Dashboards
-    "organizations:new-widget-builder-experience-design": False,
-    # Enable access to the Add to Dashboard modal for metrics work
-    "organizations:new-widget-builder-experience-modal-access": False,
     # Automatically extract metrics during ingestion.
     #
     # XXX(ja): DO NOT ENABLE UNTIL THIS NOTICE IS GONE. Relay experiences

src/sentry/features/__init__.py

@@ -104,9 +104,6 @@ default_manager.add("organizations:mobile-screenshots", OrganizationFeature, Tru
 default_manager.add("organizations:monitors", OrganizationFeature)
 default_manager.add("organizations:native-stack-trace-v2", OrganizationFeature, True)
 default_manager.add("organizations:new-weekly-report", OrganizationFeature, True)
-default_manager.add("organizations:new-widget-builder-experience", OrganizationFeature, True)
-default_manager.add("organizations:new-widget-builder-experience-design", OrganizationFeature, True)
-default_manager.add("organizations:new-widget-builder-experience-modal-access", OrganizationFeature, True)
 default_manager.add("organizations:notification-all-recipients", OrganizationFeature, True)
 default_manager.add("organizations:onboarding", OrganizationFeature)  # Only enabled in sentry.io to enable onboarding flows.
 default_manager.add("organizations:org-subdomains", OrganizationFeature)