Resolve "`gdk reconfigure` fails on Gitpod for `main` tag"

What does this Merge Request do and why?

This MR ensures the /workspace/gitlab-development-kit/gitlab directory is completely removed as part of the Gitpod Docker image creation so that a /workspace/gitlab -> /workspace/gitlab-development-kit/gitlab symlink can be created as part of starting up a new/existing Gitpod instance.

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 Issue to follow-up.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.

Closes #1335 (closed)