feat(onboarding): Register onboarding-scm-project-details-experiment flag (#113072)

- Register `organizations:onboarding-scm-project-details-experiment`
feature flag in `temporary.py` with FlagPole strategy and
`api_expose=True`
- Companion PR:
getsentry/sentry-options-automator#7262

This will be used to feature flag the project creation step of scm
onboarding.

Closes VDY-82

Author: jaydgoss

src/sentry/features/temporary.py

@@ -211,6 +211,8 @@ def register_temporary_features(manager: FeatureManager) -> None:
     manager.add("organizations:onboarding-scm", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Experiment: SCM onboarding A/B test measuring conversion impact
     manager.add("organizations:onboarding-scm-experiment", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
+    # Experiment: SCM onboarding project details A/B test
+    manager.add("organizations:onboarding-scm-project-details-experiment", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Enable large ownership rule file size limit
     manager.add("organizations:ownership-size-limit-large", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=False)
     # Enable xlarge ownership rule file size limit