Add feedback to user when trying to push to a project scheduled for deletion
<!--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=344023) </details> <!--IssueSummary end--> ## Problem to solve When a user tries to push to a repo, they get a response message about not being allowed to push but it is not explained why. ## Proposal Update the message sent back to the user in terminal sessions **Before** ``` > git push remote: You are not allowed to push code to this project. fatal: unable to access 'http://127.0.0.1:3000/group/project.git/': The requested URL returned error: 403 ``` **After** ``` > git push remote: You are not allowed to push code to this project. This project is read-only and will be deleted on YYYY-MM-DD. fatal: unable to access 'http://127.0.0.1:3000/group/project.git/': The requested URL returned error: 403 ```
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