No warning when navigating away from creating a new issue without saving
<!--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=580215)
</details>
<!--IssueSummary end-->
### Proposal
When creating a new issue using the web based editor there isn't a warning if you try to navigate away before saving, neither is there an autosave.
It would be great to prevent users from loosing work by adding either a warning or autosave of the issue draft.
As you might have guessed, I just spent 10 minutes writing a detailed issue spec, closed the wrong window, and it was gone.
issue