Remove wiki_front_matter FF

In an effort to clean up our feature flag's I wanted to reach out and see if this one can be removed? Going from: !27706 (merged) it seems we wrapped this functionality in a feature flag but never had a follow-up rollout of the feature. Are we in a place where we could consider enabling this by default or was there a reason we opted not to do that already?

requested review from @.luke and @alexkalderimis

removed review request for @.luke

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marked the checklist item I have evaluated the MR acceptance checklist for this MR. as completed

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mentioned in issue #353959 (closed)

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Async update

Enabled on production: https://gitlab.slack.com/archives/C101F3796/p1646151330613799
Testing to take place today/tomorrow
No documentation is needed
Rollout issue for reference: #353959 (closed)

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@alexkalderimis @.luke

Hey y'all

So we've completed the rollout of this flag early last week and have not seen any adverse effects on the ~"group::editor" side, given that I think it should be safe to proceed with the removal of the feature flag code. Would y'all be open to giving this a review?

requested review from @.luke and @alexkalderimis

approved this merge request

@alexkalderimis, thanks for approving this merge request.

This is the first time the merge request is approved. To ensure full test coverage, a new pipeline has been started.

For more info, please refer to the following links:

removed review request for @alexkalderimis

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@.luke

Thank you for the review! I have updated the shared example code and left a response to your question about the feature in general, please let me know what your thoughts are