[stable10] remove dead code

[patrickjahns]

backport of #31888

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• backport

[codecov]

Codecov Report

Merging #31889 into stable10 will increase coverage by <.01%.
The diff coverage is 100%.

@@              Coverage Diff               @@
##             stable10   #31889      +/-   ##
==============================================
+ Coverage       62.45%   62.45%   +<.01%     
+ Complexity      18588    18587       -1     
==============================================
  Files            1210     1210              
  Lines           72779    72773       -6     
  Branches         1273     1273              
==============================================
  Hits            45454    45454              
+ Misses          26945    26939       -6     
  Partials          380      380

Flag	Coverage Δ	Complexity Δ
#javascript	52.71% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	63.53% <100%> (ø)	18587 <0> (-1)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
apps/files_sharing/lib/Migration.php	97.08% <100%> (+5.34%)	20 <0> (-1)	⬇️

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[patrickjahns]

Needs a second look as cherry-picking lead to unwanted changes 😠

[phil-davis]

Needs ownCloud coding standard #31828 applied to stable10 so that this does not happen to people on every little backport. But that is waiting for after 10.0.9 is sorted.

[PVince81]

Extra changes look fine, related to code style. 👍

Not merging because of freeze