collab: Add `POST /billing/subscriptions/sync` endpoint (#30956)

This PR adds a new `POST /billing/subscriptions/sync` endpoint that can
be used to sync a user's billing subscriptions from Stripe.

Release Notes:

- N/A
d9f12879e2Marshall Bowers committed on 5/19/2025, 2:01:53 PM· committed by GitHubparent42dd511
1 file changedLine totals unavailable