Fix capitalisation of container registry image path

What does this MR do and why?

After enabling the [Feature flag] Rollout of `container_registry_s... (#366808 - closed) for gitlab-org group (related MR: Display container image shortened path with opt... (!91548 - merged)), noticed that some image names were capitalised, so MR fixes this issue.

Visible here: https://gitlab.com/groups/gitlab-org/-/container_registries

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Setup & enable Container Registry https://gitlab.com/gitlab-org/gitlab-development-kit/-/blob/main/doc/howto/registry.md
2. Create a new project under gitlab-org with capital letters in the project path example CNG-mirror
3. Run the following

   docker pull hello-world
   docker tag hello-world 127.0.0.1:5000/gitlab-org/cng-mirror
   docker push 127.0.0.1:5000/gitlab-org/cng-mirror

4. Visit the container registry page for group http://gdk.test:3000/groups/gitlab-org/-/container_registries & make sure the images are listed & show their full path.
5. Enable feature

   $ rails c
   > Feature.enable(:container_registry_show_shortened_path)

6. Refresh above page to see button to expand shortened path & Make image path is not capitalised.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #364290 (closed)