chore(sentry apps): Manual disable for backstop (#103086)

Author: Christinarlong

src/sentry/options/defaults.py

@@ -3641,6 +3641,14 @@
     flags=FLAG_AUTOMATOR_MODIFIABLE,
 )
 
+# Manual option for disabling misbehaving sentry apps from sending webhooks.
+register(
+    "sentry-apps.webhook.restricted-webhook-sending",
+    type=Sequence,
+    default=[],
+    flags=FLAG_AUTOMATOR_MODIFIABLE,
+)
+
 # Killswitch for web vital issue detection
 register(
     "issue-detection.web-vitals-detection.enabled",

src/sentry/utils/sentry_apps/webhooks.py

@@ -80,6 +80,9 @@ def send_and_save_webhook_request(
     with SentryAppInteractionEvent(
         operation_type=SentryAppInteractionType.SEND_WEBHOOK, event_type=event
     ).capture() as lifecycle:
+        if sentry_app.slug in options.get("sentry-apps.webhook.restricted-webhook-sending"):
+            return Response()
+
         buffer = SentryAppWebhookRequestsBuffer(sentry_app)
         org_id = app_platform_event.install.organization_id
         slug = sentry_app.slug_for_metrics