Use rubygems bundled with ruby language

Use rubygems bundled with ruby language

Removes the rubygems software configuration and updates
all dependencies to use the rubygems bundled with the
ruby language.

Closes https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/6958

Closes https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/6957

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

Changelog: other

What does this MR do?

Remove rubygems software to use bundled one in ruby software.

Related issues

Closes #6958 (closed)

Also closes #6957 (closed)

PR in the upstream: https://github.com/chef/omnibus-software/pull/1693

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
• [n/a] Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks
• trigger-package has a green pipeline running against latest commit

Expected (please provide an explanation if not completing)

• [n/a] Test plan indicating conditions for success has been posted and passes
• [n/a] Documentation created/updated
• [n/a] Tests added
• [n/a] Integration tests added to GitLab QA
• [n/a] Equivalent MR/issue for the GitLab Chart opened