Convert commit input buttons to textarea component
<!--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=430128) </details> <!--IssueSummary end--> ### Issue We're still using a `button` element for the `Reply` on commits. I believe there are accessibility concerns with this, which led to us converting the button to a `textarea` for MR/issuable replies ### Proposal Convert the `button` in `app/helpers/notes_helper.rb` to a `textarea`
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