Add comments for Vue transition classes

James Rushfordrequested to merge
gitlab-community/gitlab-org/gitlab:498297-add-comment-on-vue-transition-classes-so-that-we-do-not-accidently-remove-them-2 into master

What does this MR do and why?

Move Vue transitions into the app/assets/stylesheets/framework/vue_transitions.scss so they do not accidently get removed as they are confusing classes that have been accidentally removed a couple of times recently:

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Related to #498297 (closed)

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