Create and upload a package of GitLab Shell executables

What does this merge request do and why?

Create and upload a package of GitLab Shell executables in the bin directory

Compress GitLab Shell executables in the bin directory into a package and upload it to the package registry, so users can download and use them without needing to recompile them.

Related to #2127 (closed)

Screenshots

Setting gitlab_shell.skip_compile to true reduced the time to run make gitlab-shell-update from 11.56 seconds to 5.87 seconds, making it 5.69 seconds faster.

Without gitlab_shell.skip_compile	With gitlab_shell.skip_compile

How to set up and validate locally

1. Rerun the compile:gitlab-shell job and make sure GitLab Shell executables are uploaded to the Package Registry.

2. Download GitLab Shell executables by running:

   gdk config set gitlab_shell.skip_compile true
   make gitlab-shell-update
   gdk restart

This should not recompile GitLab Shell.

Impacted categories

The following categories relate to this merge request:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Merge request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise an issue to follow-up.
• Documentation added/updated, if needed.
• Announcement added, if change is notable.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.