chore(detectors): Add flag to rollout experimental N+1 API Call detector

[roggenkemper]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

Additional details and impacted files

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[seer-by-sentry]

Potential bug: The feature flag organizations:experimental-n-plus-one-api-detector-rollout is defined but never used, causing both stable and experimental N+1 API detectors to run simultaneously.

• Description: The new feature flag organizations:experimental-n-plus-one-api-detector-rollout is defined but is never checked in the code. Unlike the DB detectors which use a similar flag to enable an experimental version, both the stable NPlusOneAPICallsDetector and the NPlusOneAPICallsExperimentalDetector have is_creation_allowed_for_organization methods that always return True. Since both detectors are listed in DETECTOR_CLASSES, they will run simultaneously regardless of the flag's state. This prevents the intended A/B testing and gradual rollout of the experimental detector and may cause duplicate or conflicting performance issues to be generated.

• Suggested fix: Implement the feature flag check in the is_creation_allowed_for_organization method of both the stable and experimental N+1 API call detectors. The stable detector should return not features.has(...) and the experimental one should return features.has(...), mirroring the pattern used by the N+1 DB detectors. This will ensure only one of the two detectors is active at any time based on the flag.
  _{severity: 0.65, confidence: 0.95}

_{Did we get this right? 👍 / 👎 to inform future reviews.}