Bug; After importing a large reprository from another service and deleting the contents of the repro the project never deletes

Summary

After importing a large repro (Unreal Engine in my-case) to a private repro the project never deletes after multiple attempts.

Steps to reproduce

1. Import a large project to mirror as a private repro (Unreal Engine works > https://github.com/EpicGames/UnrealEngine)
2. Observe that the project can't be hosted on Gitlab.com due to storage space limits
3. Attempt to delete the project
4. Observe that all files are removed but the project is never fully deleted
5. Attempt to delete the project via the delete project button on the home page

Example Projects

https://gitlab.com/edstub207/EddieEngine/

https://gitlab.com/edstub207/gitlab-ee

What is the current bug behavior?

Observe the project never fully deletes even with no files in it

What is the expected correct behavior?

The project is deleted when the project delete is triggered

Relevant logs and/or screenshots

Note timestamps in bottom right handside (UK Time)

Delete Prompt:

Delete confirmation:

Observe that the project didn't delete and is still available in the project list:

Output of checks

Discovered on Gitlab Next on the 26th October 2020. The browser was Microsoft Edge Version 88.0.680.0 (Official build) canary (64-bit)