Permanently enable 'engine-2966-holding-rewards' flag front#5546

Ticket(s) / Related Merge Requests

front#5546 (closed)

Summary of Changes

Remove references to engine-2966-holding-rewards to permanently enable the experiment.

Testing Considerations

Holding rewards

Deployment Considerations

IMPORTANT!! Once this is merged, we also need to remove the engine-2966-holding-rewards flag from Growthbook

Regression Scope

Break holding rewards/revert to the losing side of the experiment

Platform Affected (web, mobile, etc)

Potentially both

Developer Testing Completed

Run related php spec test to ensure it doesn't break

Screenshots / Screen Recording

Three of the tests are broken, but they were already broken on master (not failing), so no change here.

Does this impact

• Localization
• Dark/light mode
• Guest mode

Definition of Done Checklist

• The Acceptance Criteria has been met
• Code is tested: Testing includes unit/spec, E2E/automated and manual testing
• Merge requests description has been filled out