Validate default values at schema definition #5543

Job	Run time
test 3.8	1m 36s
test 3.9	1m 44s
lint	55s
test 3.10	1m 44s
rust benchmarks	3m 12s
test 3.11	1m 44s
coverage	1m 8s
test 3.12	1m 34s
test-debug 3.13	58s
test 3.13	2m 3s
test MSRV	2m 55s
test-debug pypy3.10	1m 3s
test pypy3.9	2m 15s
test on ubuntu	1m 39s
test pypy3.10	1m 58s
test on macos	1m 36s
test-pydantic-integration	1m 20s
test on windows	3m 31s
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-wasm-emscripten	2m 33s
build sdist	20s
test build on ${{ matrix.os }}	0s
test build on ${{ matrix.target }}-${{ matrix.distro }}	0s
inspect-pypi-assets	0s
check	2s
release	0s
	35m 50s

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