Use core schema fns to initalize `SchemaValidator`s in the test suite. #5670

Job	Run time
build pgo-optimized on ${{ matrix.os }} / ${{ matrix.interpreter }}	0s
rust benchmarks	3m 0s
build on ${{ matrix.os }} (${{ matrix.target }} - ${{ matrix.interpreter \|\| 'all' }}${{ (((matrix.os == 'linux') && format(' - {0}', (((matrix.manylinux == 'auto') && 'manylinux') \|\| matrix.manylinux))) \|\| '') }})	0s
build sdist	10s
build-wasm-emscripten	2m 40s
coverage	1m 14s
lint	1m 0s
test-debug 3.13	45s
test MSRV	2m 52s
test-debug pypy3.10	3m 11s
test on ubuntu	1m 52s
test-pydantic-integration	1m 6s
test on macos	1m 54s
test on windows	3m 58s
test 3.9	2m 10s
test 3.10	1m 59s
test 3.11	1m 55s
test 3.12	1m 49s
test 3.13	1m 40s
test 3.13t	2m 2s
test pypy3.9	3m 58s
test pypy3.10	4m 14s
test build on ${{ matrix.target }}-${{ matrix.distro }}	0s
test build on ${{ matrix.os }}	0s
inspect-pypi-assets	0s
check	3s
release	0s
	43m 32s

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