Resolve "Make SettingsService getter function generic"

Closes #213

Pipeline fails because lib/common/src/scheduled-notifications/scheduled-notification.service.ts still contains a bunch of log statements. I didn't want to just delete them because they seem important (e.g. deferredPushSubscriptionUpdate()). Please advise.

Side note: In the PAT version, the ICS file download is broken. This is also the case on main, so won't address it here (see #217 (closed)). Prod version works fine though.