[stable10] Add webDAV acceptance tests for upload-download-propfind of unusual file names

[phil-davis]

Backport #32010

[codecov]

Codecov Report

Merging #32016 into stable10 will increase coverage by <.01%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             stable10   #32016      +/-   ##
==============================================
+ Coverage       62.45%   62.45%   +<.01%     
  Complexity      18628    18628              
==============================================
  Files            1213     1213              
  Lines           72922    72922              
  Branches         1273     1273              
==============================================
+ Hits            45540    45543       +3     
+ Misses          27002    26999       -3     
  Partials          380      380

Flag	Coverage Δ	Complexity Δ
#javascript	52.72% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	63.52% <ø> (ø)	18628 <ø> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
apps/files_trashbin/lib/Expiration.php	98.27% <0%> (+1.72%)	29% <0%> (ø)	⬇️
apps/encryption/lib/Session.php	100% <0%> (+1.96%)	22% <0%> (ø)	⬇️
apps/encryption/templates/settings-admin.php	94.11% <0%> (+5.88%)	0% <0%> (ø)	⬇️

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[phil-davis]

@PVince81 another new-test-only backport. This does not block any other acceptance tests changes in the pipeline. So it can wait or be merged - no problem either way.