Devfile gem is not correctly packaged

We need to get the devfile gem in a production-ready state: https://gitlab.com/gitlab-org/remote-development/devfile-gem

There are several issues open against the gem: https://gitlab.com/gitlab-org/remote-development/devfile-gem/-/issues

In addition...

• We have to figure out exactly how to do the multi-platform packaging, which is essentially to “make it like nokogiri”, and we can also take inspiration from the rust-based yrb gem Hannes made (although he relied on GitHub Actions some, which we can’t.

• And we also need to set up a solid continuous versioning, delivery and release automation pipeline, like we’ve done for the VS Code fork.

And also address the following:

• The require should be in the file where the gem is used, in devfile_processor.rb, not in desired_config_generator.rb. Also, if we do it this way, we should put require: false in the Gemfile for this gem, so it's not required during rails init.

• (NO LONGER HAPPENING) @cwoolley-gitlab started a discussion:

  suggestion: RubyMine still shows a No such file to load warning on this require.

  That implies that we still don't have something right in the specification for the gem to get the devfile.rb on the load path properly.

  I know we have other cleanup to do on the gem and its spec for multiplatform/etc.

  Can we make sure we include looking into this require problem as an issue or a task on an existing issue for the gem cleanup?