Replace CalDAV availability component with component lib

[ChristophWurst]

Requires nextcloud/calendar-availability-vue#6

/settings/user/groupware should work like before. This is an internal clean-up/refactoring to deduplicate some code.

This also fixes the regression from #30020 that all of the personal settings front-end was missing.

[miaulalala]

I can't save working hours any more:

could not save availability TypeError: Object(...) is not a function
    at _callee2$ (CalendarService.js:134)
    at tryCatch (runtime.js:63)
    at Generator.invoke [as _invoke] (runtime.js:294)
    at Generator.next (runtime.js:119)
    at asyncGeneratorStep (CalendarService.js:19)
    at _next (CalendarService.js:21)
    at CalendarService.js:21
    at new Promise (<anonymous>)
    at CalendarService.js:21
    at _saveScheduleInboxAvailability (CalendarService.js:152)```

[miaulalala]

Works now!

[st3iny]

Tested and works.

[miaulalala]

Drone failure unrelated.

[ChristophWurst]

/compile amend /

[ChristophWurst]

Uncaught ReferenceError: assignment to undeclared variable ICAL

doesn't work anymore, yay.

[ChristophWurst]

https://github.com/nextcloud/calendar/blob/0554ef4ddc45369872db41f84ffca08559d76f7b/webpack.config.js#L67-L73 might be necessary

[st3iny]

https://github.com/nextcloud/calendar/blob/0554ef4ddc45369872db41f84ffca08559d76f7b/webpack.config.js#L67-L73 might be necessary

Done! Tested and it works fine again.

[st3iny]

I tried to rebase and have bad news: server requires @nextcloud/vue v5 but calendar-availability-vue requires v4.2 as a peer. We have to update and release the lib first.