Add Puma on_worker_shutdown hook

What does this MR do?

Adds Puma's on_worker_shutdown hook to call into our life-cycle API.

See related issues for how this will be used.

Related issues

• gitlab!103372 (merged)
• gitlab#370077 (closed)
• gitlab-org/build/CNG!1195 (merged)
• gitlab-development-kit!2803 (merged)

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
• Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks
• NOTE: This cannot turn green before gitlab!103372 (merged) is merged. trigger-package has a green pipeline running against latest commit

Expected (please provide an explanation if not completing)

None of these are necessary since we are just reflecting the same change we made in gitlab!103372 (merged), where this is tested.

• 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