Fix registry-list deselecting items after select all

What does this MR do and why?

From comment, fixes these issues:

• Once all the packages are selected it's impossible to deselect a couple. As soon as I deselect one, they all get deselected:

  deselecting

  Expected to deselect a few that perhaps I didn't want to delete.

• the lines between seem to double and that's why the divider looks thicker (compared to non-selected).

Screenshots or screen recordings

the lines between seem to double and that's why the divider looks thicker (compared to non-selected).

Container registry

Package registry

deselect images and add indeterminate state

Container registry

Package registry

How to set up and validate locally

1. Publish few packages with same name & different versions, as mentioned in https://gitlab.com/gitlab-org/ci-cd/package-stage/package/-/wikis/Packages-Tips-&-Tricks#how-to-create-a-list-of-packages-artificially

   1. rails c - Open the rails console

   2. p = Project.find(1) - Find one of your GDK projects. Project id can be found on the project home page

   3. FactoryBot.create_list(:npm_package, 10, project: p, name: p.name) - Creates 10 npm packages

   4. Add this line if above fails during the creation of files

       def fixture_file_upload(*args, **kwargs)
         Rack::Test::UploadedFile.new(*args, **kwargs)
       end

2. View projects package list page.
3. Add fix to add highlighting when selected
   1. Replace line with <list-item data-testid="package-row" :selected="selected" v-bind="$attrs">
4. Make sure above issues (double margin & deselecting after select all unselects all items) are fixed.
5. Since this is a shared component, this can be tested on the container registry image tags page as well. Steps: 4. Setup & enable Container Registry https://gitlab.com/gitlab-org/gitlab-development-kit/-/blob/main/doc/howto/registry.md
   1. Add a few images with tags by following https://gitlab.com/gitlab-org/ci-cd/package-stage/package/-/wikis/Packages-Tips-&-Tricks#how-to-add-images-with-tags-quickly-to-the-registry
   2. Visit the tags page where bulk deletion pattern exists & behaviour works the same way.

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 #374295 (closed)