Don't display "designs upload requirements" when repository feature is disabled for project
<!---
Please read this!
Before opening a new issue, make sure to search for keywords in the issues
filtered by the "regression" or "bug" label:
- https://gitlab.com/gitlab-org/gitlab/issues?label_name%5B%5D=regression
- https://gitlab.com/gitlab-org/gitlab/issues?label_name%5B%5D=bug
and verify the issue you're about to submit isn't a duplicate.
--->
### Summary
GitLab displays the following warning in issues belonging to a project which has the repository feature disabled:

### Steps to reproduce
On a self-hosted Core instance which satisfies the requirements for design uploads, create a new project, disable the repository feature and create an issue.
### What is the current *bug* behavior?
The warning above is displayed. It does not say anything about requiring the disabled repository feature to work. It suggests a misconfiguration of GitLab.
### What is the expected *correct* behavior?
No warning message shown.
### Possible fixes
Don't display the message on projects with the repository feature disabled.
issue