* refactor: First high level changes to getUsersAvailability
* Fix usage of getUserAvailability where getUsersAvailability is unused
* Fix user.schema.ts in APIv2
* User handler did not provide initial data
* Small ts fixes
* Set user non-nullable in getTimezoneFromDelegatedCredential
* Small ts fixes, ensure consumers are aware its nonnullable
* Mode is defaulted to none
* Mode is defaulted to none, fix ts when directly using fn (temp)
