fix: fix config manifest type

[hikiko4ern]

This PR fixes types from #969

Because Chrome's manifest types have an index signature [key: string]: any, Omit<chrome.runtime.ManifestV3, ...> becomes

{
  [x: string]: any;
  [x: number]: any;
}

and only the added properties remain in UserManifest

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[hikiko4ern]

Hmm, some test types are not compatible with the new Chrome types, with some of the types being stricter. For example, permissions allows to pass only permissions
https://github.com/DefinitelyTyped/DefinitelyTyped/blob/d27d2e402326d17b9ca12a7030ff2f709ec57162/types/chrome/index.d.ts#L7377-L7451
while not allowing hosts like *://google.com/*

[aklinker1]

Haha interesting that that works but omit doesnt

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.70%. Comparing base (fbe502f) to head (691699a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #973      +/-   ##
==========================================
- Coverage   82.25%   81.70%   -0.55%     
==========================================
  Files         125      125              
  Lines        6604     6604              
  Branches     1104     1098       -6     
==========================================
- Hits         5432     5396      -36     
- Misses       1158     1194      +36     
  Partials       14       14              

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[hikiko4ern]

that works but omit doesnt

fwiw: this is because Omit works by removing keys from keyof T (and keyof T becomes too wide string | number when index signatures are present; here's a short example of how this unfolds), but mapped types, roughly speaking, handle each key separately (in the example it's first a, then b, then the index signature), so keys are not widened

[aklinker1]

Interesting, thanks for sharing! Learn something new every day lol