Optimized traversal of schema tree for schema cleaning (`GenerateSchema.clean_schema`) #5185

Job	Run time
test MSRV	2m 34s
coverage	2m 6s
test-debug 3.13	1m 5s
test on ubuntu	1m 57s
test-debug pypy3.10	1m 23s
test on macos	2m 16s
test 3.8	1m 51s
test on windows	4m 24s
test 3.9	2m 12s
test 3.10	2m 5s
test 3.11	1m 56s
rust benchmarks	2m 26s
test 3.12	2m 0s
test 3.13	1m 56s
build on ${{ matrix.os }} (${{ matrix.target }} - ${{ matrix.interpreter \|\| 'all' }}${{ (((matrix.os == 'linux') && format(' - {0}', (((matrix.manylinux == 'auto') && 'manylinux') \|\| matrix.manylinux))) \|\| '') }})	0s
test pypy3.9	2m 8s
test pypy3.10	2m 11s
build pgo-optimized on ${{ matrix.os }} / ${{ matrix.interpreter }}	0s
build sdist	26s
build-wasm-emscripten	2m 27s
lint	1m 12s
test-pydantic-integration	2m 32s
test build on ${{ matrix.os }}	0s
test build on ${{ matrix.target }}-${{ matrix.distro }}	0s
inspect-pypi-assets	0s
check	1s
release	0s
	41m 8s

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