Import project by URL where source repository maximum repository limit using LFS files should fail
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### Problem to solve
It is currently possible to import repositories greater than the maximum repository limit using the `Import project by URL` option where the repository has LFS files causing the overage.
After import the repo is immediatley in a read only state and users are unable to follow the [Reduce repository size instructions](https://docs.gitlab.com/ee/user/project/repository/reducing_the_repo_size_using_git.html) as pushes are rejected.
The user can not remedy the issue other than deleting the project.
### Steps to reproduce
1. Push a 12GB repo 12 x 1GB LFS files to a self managed instance
1. Import the project from the self managed instance using the URL option
- Select New project.
- Select Repository by URL.
- Enter a Git repository URL & complete the remaining fields
- Select Create project.
### Proposal
GitLab should should check whether the repository exceeds the maximum repository size limit is reached and fail gracefully before the repository is placed into read only mode.
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