[stable11] Fix the storage info and other checks when the user has wrong casing

[nickvergessen]

Backport #4457

[mention-bot]

@nickvergessen, thanks for your PR! By analyzing the history of the files in this pull request, we identified @rullzer, @LukasReschke and @tomneedham to be potential reviewers.

[codecov]

Codecov Report

Merging #4459 into stable11 will decrease coverage by 24.68%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##             stable11    #4459       +/-   ##
===============================================
- Coverage       57.39%   32.71%   -24.69%     
+ Complexity      19439    19094      -345     
===============================================
  Files            1214     1207        -7     
  Lines           72567    69531     -3036     
  Branches         1237     1237               
===============================================
- Hits            41651    22744    -18907     
- Misses          30916    46787    +15871

Impacted Files	Coverage Δ	Complexity Δ
...rovisioning_api/lib/Controller/UsersController.php	100% <100%> (+17.12%)	93 <0> (-2)	⬇️
apps/user_ldap/lib/Settings/Admin.php	0% <0%> (-100%)	5% <0%> (ø)
apps/sharebymail/tests/ShareByMailProviderTest.php	0% <0%> (-100%)	24% <0%> (ø)
lib/public/Comments/CommentsEvent.php	0% <0%> (-100%)	3% <0%> (ø)
apps/files_trashbin/lib/Command/Expire.php	0% <0%> (-100%)	3% <0%> (ø)
...ps/comments/tests/Unit/AppInfo/ApplicationTest.php	0% <0%> (-100%)	4% <0%> (ø)
...public/AppFramework/OCS/OCSBadRequestException.php	0% <0%> (-100%)	1% <0%> (ø)
lib/private/TagManager.php	0% <0%> (-100%)	4% <0%> (ø)
...rivate/Authentication/Token/DefaultTokenMapper.php	0% <0%> (-100%)	10% <0%> (ø)
lib/private/DB/OCSqlitePlatform.php	0% <0%> (-100%)	5% <0%> (ø)
... and 501 more