Stop appending Root image in the frontend

Context

When you have many image repositories in your container registry, it's important that you can easily search for them, so that you can efficiently find the one you are looking for and validate that it's correct or troubleshoot when something has gone wrong.

Problem to solve

But, if you publish an image without a tag name, we display Root image in the UI. Based on recent user research, we learned that users found this confusing and not helpful.

Proposal

Stop appending Root image in the Container Registry UI.

Currently shown in UI	Proposal
company/group/project/ Root image	project

Breadcrumb

No longer show Root image in breadcrumb on the image repository detail page. Instead, show the name of the project.

Before	After

Title

No longer show Root image as title on the image repository detail page. Instead, show the name of the project.

Implementation

• All changes needed are contained within https://gitlab.com/gitlab-org/gitlab/-/tree/master/app/assets/javascripts/packages_and_registries/container_registry/explorer