Remove ee/spec from final package

What does this MR do?

Remove ee/spec from final package

$ du -csh ee/spec/
 20M	ee/spec/

Related issues

Checklist

See Definition of done.

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

Test plan

• Check that the final package still boots

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
• Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks - https://dev.gitlab.org/gitlab/omnibus-gitlab/-/commits/drop_ee_spec_from_rails_package
• trigger-package has a green pipeline running against latest commit

Expected (please provide an explanation if not completing)

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