`gitlab.arm.com` now has the package registry enabled.

GitLab has a restriction of 10MiB for release asset uploads.

Package registry has 100MiB limit.

The 10MiB limit is too restrictive for any packages that contain
pre-built binaries.

This patch removes the package archive upload to enable larger
package uploads.

_Ideally_, we would just want to export it as ECMAscript module.

For now, to support both, we can use a shared JSON file.

It would be nice to use the `import cfg from "./config.js" assert { "json" };` but
that is experimental.

Templating is not supported by `@semantic-release/gitlab`, yet.

`gitlab.arm.com` does not have the package registry turned on, yet.

It is not needed.

The new license is not a markdown file, so the symlink filename
was incorrect.

The package needs to be set to private, as we aren't members of
`@semantic-release`, and so can't publish this to NPM.

The licence and repository URL were also out of date, and have now
been updated.

K8s runners aren't currently available, so EC2 will be used for
now.

As `gitlab-release-channels` doesn't currently have a published
package on OSS, its config needs to be manually included for now.

The dependencies (both dev and peer) also needed to be added and
updated, as some were missing and some were outdated.

This isn't currently public, so cannot be used in the OSS version
for now.

This means reusing CI present in
`config-release-channels`, along with updating the licence
structure to comply with the REUSE specification.