Don't warn on missing fields if exclude_* are used

[adriangb]

Fixes pydantic/pydantic#6357

Selected Reviewer: @davidhewitt

[adriangb]

please review

[codecov]

Codecov Report

Merging #727 (ea44bb3) into main (0d12efd) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #727   +/-   ##
=======================================
  Coverage   93.63%   93.63%           
=======================================
  Files          99       99           
  Lines       13911    13913    +2     
  Branches       25       25           
=======================================
+ Hits        13026    13028    +2     
  Misses        879      879           
  Partials        6        6           

Impacted Files	Coverage Δ
src/serializers/fields.rs	94.49% <100.00%> (+0.05%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging #727 will not alter performances

_{Comparing dont-warn-exclude-default (ea44bb3) with main (0d12efd)}

Summary

✅ 125 untouched benchmarks

[davidhewitt]

For the future, it seems to be it would be most precise if the serializer was able to compute the set of fields which are expected (after reviewing defaults and unset values). However this would be a much more involved change which isn't necessary right now given that this is a sanity check.