[frontend] Empty SHA256/SHA1 field when modifying File Observable (#8973)

[ValentinBouzinFiligran]

Proposed changes

• empty hash value won't be displayed on details thanks to a filter

Related issues

• Empty SHA256/SHA1 field when modifying File Observable #8973

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[ValentinBouzinFiligran]

I used a filter to not apply any new logic/complexity on SCO mutation or hash processing on the front end.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.29%. Comparing base (864bcea) to head (975ee63).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8991      +/-   ##
==========================================
- Coverage   66.29%   66.29%   -0.01%     
==========================================
  Files         597      597              
  Lines       61089    61098       +9     
  Branches     6287     6292       +5     
==========================================
+ Hits        40501    40502       +1     
- Misses      20588    20596       +8     

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[Gwendoline-FAVRE-FELIX]

Functionally it works, but it still creates empty values in the back. Is this a problem or not?