When repository feature is disabled, show explicit message instead of blank project page

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Summary

The UX is not great

Steps to reproduce

1. Create test project
2. Toggle off the Repository feature on /edit#js-general-project-settings
3. Check project's main page.

Example Project (instead of logs and/or screenshots)

https://gitlab.com/katrinleinweber_ultimate_group/gl-434367-repo-disabled

What is the current bug behavior?

If the user has set Project overview content to Files and Readme (default), the resulting project's main page is a bare-bone version of /activity without any indication of that fact or of the disabled feature.

When setting Activity instead, the content is more clearly that, but without the /activity URL.

What is the expected correct behavior?

Better UX, for example an alert/banner and links to /edit#js-general-project-settings and mentions the Repository toggle.

Output of checks

This bug happens on GitLab.com

Results of GitLab environment info

Results of GitLab application Check

Possible fixes