Notify user on the implications of conducting a project rename on the container registry

Context

On the completion of Call the rename base repository API when changi... (#424801 - closed) & [Feature flag] Enable renaming_project_with_tags (#429734 - closed) but before enabling the feature for rails to "allow renaming projects with existing container repositories", We want to make sure that when the feature is being used (to conduct a rename) we have communicated to users the effects of executing a project rename (on the container registry).

Suggestion

As pointed out by @rchanila in #420755 (comment 1497097011):

The user action will be done on the individual settings pages.

Sample mock:

Text should read:

During the change, the container registry will be inaccessible. Ongoing image uploads will fail and need to be retried.