ui: remove remaining TZ switches and show schedule tz as primary

[Forfold]

If the local timezone is different from the schedule timezone, render a hint for the user of the local time.

FormFields can use FormLabel hint text, and everywhere use can use Tooltips that show local time on hover

Remaining spots with the switch:

• ScheduleAssignmentsFilter and List (the TZ toggle is the only option so we can delete the filter component)
• ScheduleOverridesFilter and List
• ScheduleShiftsFilter and List

Example screenshot of the override form being used today:

[tony-tvu]

https://github.com/target/goalert/pull/2416

Waiting on playwright branch to merge so that we can test in different timezones.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity.