Quarantine the spec/requests/api/npm_group_packages_spec.rb spec file

Context

• See https://gitlab.com/groups/gitlab-com/engineering-division/-/work_items/3#note_2081997791
• Contributes to #481983 (closed)

What does this MR do and why?

Quarantine a spec file that takes 47min to execute.

It is currently the slowest spec file we have in gitlab-org/gitlab 🏅 :

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