Move contents of Mixins to class where it is used if it is only used once - Part 2

James Rushfordrequested to merge
gitlab-community/gitlab-org/gitlab:497253-move-contents-of-mixins-to-class-where-it-is-used-if-it-is-only-used-once-2-part-2 into master

What does this MR do and why?

This collection of mixins are only used one time, so we care removing them and moving the contents to the single place it is being used. There should be no effects from this change other than less code.

Part 2 of !167852 (merged)

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Related to #497253 (closed)

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