Update feature flag to be enabled by default

Anas Shahidrequested to merge
anas/remove-ff into master

What does this MR do and why?

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Issue: Needs to be included in post-release, gitlab-com/www-gitlab-com!140896 (merged)

Since we are rolled out, 100% for Gitlab users, setting the FF to be default_enabled. Didn't remove the FF as SM users don't have this functionality yet. Once it is 100% deployed, it will also be removed.

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