eslint: reconsider/fix no-new violations
<!--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=20766) </details> <!--IssueSummary end--> we have 100+ occurrences of `eslint-disable no-new`. And a lot of workarounds to dodge it (i.e. `() => new Flash('Uh-oh')`) We should either disable this rule, or fix the violations.
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