Cleanup format

[KhafraDev]

FormData is better now, made Response/Request start with Response { or Request {, etc.

> var fd = new FormData()
> fd.set('a', 'b')
> fd.append('a', new Blob(['hello']), 'hello.txt')
> fd.set('file', new Blob(['file']))
> fd

FormData {
  a: [
    'b',
    File { size: 5, type: '', name: 'hello.txt', lastModified: 1710432489080 }
  ],
  file: File { size: 4, type: '', name: 'blob', lastModified: 1710432492961 }
}

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 82.14286% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 93.48%. Comparing base (2e11fc8) to head (db795e4).
Report is 3 commits behind head on main.

Files	Patch %	Lines
lib/web/fetch/formdata.js	75.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2959      +/-   ##
==========================================
- Coverage   93.48%   93.48%   -0.01%     
==========================================
  Files          89       89              
  Lines       24160    24171      +11     
==========================================
+ Hits        22587    22597      +10     
- Misses       1573     1574       +1     

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[mcollina]

lgtm

[Uzlopak]

Lgtm