Media and files upload: skip check mime type

[didoda]

This update the "check mime type". When the object type is "media" or "files", all mime types are accepted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.65%. Comparing base (fe029b4) to head (058f681).
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##             master    #1228    +/-   ##
==========================================
  Coverage     99.65%   99.65%            
- Complexity     1321     1339    +18     
==========================================
  Files            97       98     +1     
  Lines          5151     5252   +101     
==========================================
+ Hits           5133     5234   +101     
  Misses           18       18            

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