fix: ensure unsubscribe event captures user context for logged-out users #36247
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Description
When a user unsubscribed from email digests using a browser where they were not logged in, the event tracker (tracker.emit) did not store the user context. As a result, the user_id and username fields were recorded as NULL in the tracking_events_with_metadata table.
This PR fixes the issue by ensuring that, even if the user is not logged in, the event captures and stores the user context from the unsubscribe request. The event payload now always includes user_id and username, preventing data inconsistencies in tracking.
Related ticket
https://2u-internal.atlassian.net/browse/INF-1790
Testing instructions