Issue Vue app tech debt
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=19620) </details> <!--IssueSummary end--> - [ ] Duplication between some components. Most notable & confusing is the form. https://gitlab.com/gitlab-org/gitlab-ce/blob/master/app/assets/javascripts/notes/components/issue_comment_form.vue & https://gitlab.com/gitlab-org/gitlab-ce/blob/master/app/assets/javascripts/notes/components/issue_note_form.vue I would think we should have 1 `form` component for it & then just disable/remove the things the form doesn't support.
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