Save MR description when changing target branches in create mode
<!--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=22380) </details> <!--IssueSummary end--> # Problem: 1. I create a branch B from branch A in the terminal 1. I push the branch and I get the MR link in the terminal 1. I click it and it opens the MR create page 1. I fill in the data (title and description, scroll down and then notice that the target branch is master, however I want to merge against A) 1. I click change target branches, go to that page and click Compare branches and continue 1. The description and title I filled in 4 are gone # Possible solution: Use the `autosave.js` plugin we already use when accidentaly closing the tab while editing/creating an issue/mr/comment
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