Add a UI for the Nextcloud CalDAV trashbin

[ChristophWurst]

This adds a UI to list and restore deleted calendars and calendar objects, as discussed in nextcloud/server#1662.

Todo

• Requires Add a trashbin for calendars and calendar objects server#26083
• Requires Add APIs required for the CalDAV trashbin cdav-library#474
• Add trashbin modal and navigation entry
• List deleted calendars
• List deleted events (objects)
• Restore calendars
• Reload calendar list to show restored calendar right away
• Restore events
• Reload calendar to show restored event right away Restored event does not show right away #3125
• Show a footer about the retention time of elements in the trash bin Tell the user when their trashbin elements will be deleted #3126
• Show time human readable and relative to current time (2 days ago and similar)
• Make it possible to delete items in the trashbin permanently Allow users to delete trash bin elements permanently #3127

[codecov]

Codecov Report

Merging #3118 (b0e1a01) into master (d358987) will decrease coverage by 0.44%.
The diff coverage is 3.60%.

❗ Current head b0e1a01 differs from pull request most recent head ba0d245. Consider uploading reports for the commit ba0d245 to get more accurate results

@@             Coverage Diff              @@
##             master    #3118      +/-   ##
============================================
- Coverage     29.41%   28.97%   -0.45%     
  Complexity      121      121              
============================================
  Files           155      157       +2     
  Lines          5609     5705      +96     
  Branches        826      836      +10     
============================================
+ Hits           1650     1653       +3     
- Misses         3959     4052      +93     

Flag	Coverage Δ
javascript	23.49% <3.60%> (-0.38%)	⬇️
php	94.54% <ø> (ø)

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Impacted Files	Coverage Δ
...NavigationHeader/AppNavigationHeaderDatePicker.vue	0.00% <0.00%> (ø)
...c/components/AppNavigation/CalendarList/Moment.vue	0.00% <0.00%> (ø)
...components/AppNavigation/CalendarList/Trashbin.vue	0.00% <0.00%> (ø)
src/store/calendars.js	0.00% <0.00%> (ø)
src/views/Calendar.vue	0.00% <0.00%> (ø)
src/views/Dashboard.vue	0.00% <ø> (ø)
src/services/caldavService.js	29.82% <23.07%> (+0.97%)	⬆️
src/services/windowTitleService.js	95.65% <50.00%> (-4.35%)	⬇️

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