Use core schema fns to initalize `SchemaValidator`s in the test suite. #5668

Job	Run time
rust benchmarks	2m 41s
build on ${{ matrix.os }} (${{ matrix.target }} - ${{ matrix.interpreter \|\| 'all' }}${{ (((matrix.os == 'linux') && format(' - {0}', (((matrix.manylinux == 'auto') && 'manylinux') \|\| matrix.manylinux))) \|\| '') }})	0s
build pgo-optimized on ${{ matrix.os }} / ${{ matrix.interpreter }}	0s
build sdist	12s
build-wasm-emscripten	2m 30s
coverage	1m 15s
lint	29s
test-debug 3.13	50s
test MSRV	2m 51s
test-debug pypy3.10	3m 8s
test on ubuntu	2m 3s
test on macos	2m 42s
test-pydantic-integration	1m 16s
test on windows	3m 38s
test 3.9	2m 0s
test 3.10	1m 53s
test 3.11	2m 2s
test 3.12	1m 43s
test 3.13	1m 57s
test 3.13t	1m 57s
test pypy3.9	4m 3s
test pypy3.10	4m 10s
test build on ${{ matrix.target }}-${{ matrix.distro }}	0s
test build on ${{ matrix.os }}	0s
inspect-pypi-assets	0s
check	3s
release	0s
	43m 23s

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