feat(issue-detection): Register ai-issue-detection feature flag

Add `organizations:ai-issue-detection` FlagPole flag for gating budget-paced
AI issue detection scheduling per organization.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: roggenkemper

src/sentry/features/temporary.py

@@ -50,6 +50,8 @@ def register_temporary_features(manager: FeatureManager) -> None:
     manager.add("organizations:alert-allow-indexed", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Enables flag for org specific runs on alerts comparison script for spans migration
     manager.add("organizations:alerts-timeseries-comparison", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=False)
+    # Enable AI-based issue detection for an organization (budget-paced scheduling)
+    manager.add("organizations:ai-issue-detection", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=False)
     # Enable anomaly detection feature for EAP spans
     manager.add("organizations:anomaly-detection-eap", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Enables the cron job to auto-enable codecov integrations.