remove expect_fields_set

[samuelcolvin]

This PR has been adjusted to just be the changes to remove expect_fields_set - all typed dict validators inside a model validator must return fields set.

[codspeed-hq]

CodSpeed Performance Report

Merging #565 custom_init (4c4fe8a) will not alter performances.

Summary

🔥 0 improvements
❌ 2 regressions
✅ 109 untouched benchmarks

🆕 0 new benchmarks
⁉️ 2 dropped benchmarks

Benchmarks breakdown

	Benchmark	main	custom_init	Change
❌	test_model_instance	49.1 µs	54.1 µs	-10.16%
❌	test_model_instance_abc	49.9 µs	55.2 µs	-10.53%
⁉️	test_core_python_not_fs	367.8 µs	N/A	N/A
⁉️	test_core_json_not_fs	799.2 µs	N/A	N/A

[codecov-commenter]

Codecov Report

Merging #565 (4c4fe8a) into main (cb42663) will increase coverage by 0.00%.
The diff coverage is 100.00%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #565   +/-   ##
=======================================
  Coverage   94.19%   94.20%           
=======================================
  Files          95       94    -1     
  Lines       12845    12762   -83     
  Branches       24       24           
=======================================
- Hits        12099    12022   -77     
+ Misses        740      734    -6     
  Partials        6        6           

Impacted Files	Coverage Δ
pydantic_core/core_schema.py	96.86% <ø> (ø)
src/argument_markers.rs	87.87% <ø> (ø)
src/lib.rs	100.00% <ø> (ø)
src/validators/chain.rs	85.07% <ø> (-2.43%)	⬇️
src/validators/custom_error.rs	87.32% <ø> (-3.22%)	⬇️
src/validators/function.rs	90.59% <ø> (-0.49%)	⬇️
src/validators/generator.rs	93.23% <ø> (+2.19%)	⬆️
src/validators/json.rs	97.87% <ø> (-0.13%)	⬇️
src/validators/nullable.rs	100.00% <ø> (+7.69%)	⬆️
src/validators/typed_dict.rs	98.38% <ø> (-0.05%)	⬇️
... and 7 more

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[samuelcolvin]

The regressions are just because these two tests had to have return_fields_set added to them.