[stable-3.29] use preview endpoint instead of thumbnail

[backportbot]

Backport of PR #13164

[github-actions]

Lint

Type	stable-3.29	PR
Warnings	69	69
Errors	3	3

SpotBugs

Category	Base	New
Bad practice	65	65
Correctness	71	71
Dodgy code	340	340
Experimental	1	1
Internationalization	7	7
Multithreaded correctness	6	6
Performance	57	57
Security	19	19
Total	566	566

[github-actions]

Lint

Type	stable-3.29	PR
Warnings	69	69
Errors	3	3

SpotBugs

Category	Base	New
Bad practice	65	65
Correctness	71	71
Dodgy code	340	340
Experimental	1	1
Internationalization	7	7
Multithreaded correctness	6	6
Performance	57	57
Security	19	19
Total	566	566

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/13453.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 27.21%. Comparing base (c331add) to head (30229b3).
Report is 7 commits behind head on stable-3.29.

Files	Patch %	Lines
...loud/android/datamodel/ThumbnailsCacheManager.java	50.00%	2 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##             stable-3.29   #13453       +/-   ##
==================================================
+ Coverage               0   27.21%   +27.21%     
- Complexity             0     3319     +3319     
==================================================
  Files                  0      635      +635     
  Lines                  0    46821    +46821     
  Branches               0     6207     +6207     
==================================================
+ Hits                   0    12742    +12742     
- Misses                 0    32194    +32194     
- Partials               0     1885     +1885     

Files	Coverage Δ
...loud/android/datamodel/ThumbnailsCacheManager.java	35.42% <50.00%> (ø)

... and 634 files with indirect coverage changes