Revert "Merge branch 'fix/update-labkit' into 'master'"

What does this MR do and why?

Revert "Merge branch 'fix/update-labkit' into 'master'"

This reverts merge request !218779 (merged)

The remote feature categories validation in labkit broke the airgapped QA environment due to it trying to fetch the schema from https://gitlab.com/gitlab-org/gitlab/-/raw/master/config/feature_categories/schema.json.

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Before	After

How to set up and validate locally

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