closes https://github.com/TryGhost/Toolbox/issues/386
- When the API request was made using staff token the source attribution was "user" instead of "api". Misattribution caused ripple effects in limit service.
- The fix also adds a new combination of data available on the `req` object - both `user` and `api_key` can be present when the request is done using a staff (user) token. Having both pieces of data on the request object gives more context for business logic, did not find a good reason to keep it "pure" with either `api_key` or `user` property.
refs https://github.com/TryGhost/Team/issues/1141
- when a member had canceled subscriptions the check we have to match products to subscriptions to determine whether to insert the hardcoded complimentary subscription was incorrectly matching against the canceled subscriptions
- updated to match only active subscriptions
