For missing fields, we don't warn on exclude_, so don't warn on exclude

[sydney-runkle]

Inspired by @adriangb's #727

Fix pydantic/pydantic#9882

[codspeed-hq]

CodSpeed Performance Report

Merging #1403 will not alter performance

_{Comparing no-warn-on-exclude (128795c) with main (39a6b10)}

Summary

✅ 155 untouched benchmarks

[adriangb]

Can we get a test showing the change in behavior and documenting the new expected behavior?