Use resources instead of resource for file controller actions

[hellcp-work]

Changes all the actions to use resources routes, so that it aligns more with how it's used. In practice that means that in update action, there is a file name parameter. Depends on #15753

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 86.02%. Comparing base (a6f0447) to head (4fa21b2).
Report is 40 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #15754   +/-   ##
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  Coverage   86.02%   86.02%           
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  Files         793      793           
  Lines       26011    26015    +4     
=======================================
+ Hits        22375    22379    +4     
  Misses       3636     3636