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implement onSubChange for FID-based registration (#9996)

* implement onSubChange for FID-based registration

* Persist VAPID key in FID registration metadata to fix re-registration issue

* Enforce mutual exclusivity of token and FID registrations in DB layer

* Notify clients in onSubChange on successful FID refresh

- Update onSubChange to notify window clients when FID registration is refreshed. Previously it did not notify clients.
- Update refreshFidRegistrationIfStored to return the current FID.
- Update onSubChange to use the returned FID and only notify if the refresh was successful.
- Add unit tests to verify client notification on success, failure, and when not registered.
- Fix a lint error in window-listener.ts by adding the FidRegisteredPayload interface.

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Co-authored-by: Kai Wu <zwu52@users.noreply.github.com>

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