No longer have .ruby-version as a symlink

Ash McKenzierequested to merge
947-gdk-needs-its-own-ruby-version into master

What does this Merge Request do?

This MR removes .ruby-version from being a symlink and is instead a checked in file that is managed within the gitlab-org/gitlab-development-kit/ project.

Merge Request checklist

  • Tests added for new functionality. If not, please raise Issue to follow-up.
  • This change is backward compatible. If not, please include steps to communicate to our users.
  • Documentation added/updated, if needed.
  • gdk doctor test added, if needed.

Closes #947 (closed)

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