Update pydantic-core to 2.10.0

[adriangb]

(waiting for release)

[adriangb]

For what it's worth if I comment out the validate_core_schema calls only 1 test fails that was explicitly testing for this. This tells me that pydantic generally builds valid well typed schemas, so adding an env var based flag to disable schema validation so users can speed up their tests / deployments (e.g. by having only a single test that explicitly validates the schemas by setting the env var to validate and booting up their FastAPI app) would work great. It cuts schema generation time in around half, to better than v1 levels.

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[adriangb]

Looks like we'll need to update FastAPI as well cc @tiangolo

[samuelcolvin]

replaced by #7542 which cherry-picks some of these commits.