ui/schedules: flip timezone locale for shifts list

[Forfold]

Description:
This PR flips the locale for the schedule shifts list, defaulting to the user's local timezone. The tooltip hover will render the timestamp in the schedule's timezone and will show the full date if there is more than a day difference.

Which issue(s) this PR fixes:
Fixes #3496
Part of #3492

Out of Scope:
Other schedule routes

Screenshots:

PST local, CST schedule:

PST local, Australia/Adelaide (+1 day) schedule:

[mastercactapus]

LGTM

a good follow-up to this would be bringing the shifts list up to date with using the Time component -- I'm sure there are a few other places missing it too. I think we need to update it to handle ranges though

[Forfold]

@mastercactapus Agreed. I was thinking this page would be a simple update to the Time component but it's doing everything manually