Add a footer for trash bin

[GretaD]

Fixes #3126

• Requires Export the CalDAV trash bin retention duration as property server#27348
• Requires Request the calendar trash bin duration prop cdav-library#481

[codecov]

Codecov Report

Merging #3130 (9ce9b5c) into master (e69a53a) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

❗ Current head 9ce9b5c differs from pull request most recent head 7b32067. Consider uploading reports for the commit 7b32067 to get more accurate results

@@             Coverage Diff              @@
##             master    #3130      +/-   ##
============================================
- Coverage     28.92%   28.91%   -0.02%     
  Complexity      121      121              
============================================
  Files           157      157              
  Lines          5715     5717       +2     
  Branches        839      839              
============================================
  Hits           1653     1653              
- Misses         4062     4064       +2     

Flag	Coverage Δ
javascript	23.44% <0.00%> (-0.01%)	⬇️
php	94.54% <ø> (ø)

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Impacted Files	Coverage Δ
...components/AppNavigation/CalendarList/Trashbin.vue	0.00% <0.00%> (ø)

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[ChristophWurst]

@GretaD please give this a final test but I think we can merge this :)

[tcitworld]

Is it worth it to handle the property being not found?

Since nextcloud/server#27348 is not yet in the latest beta, there's a very nice NaN.

[ChristophWurst]

Sure, some robustness would be good!