ci: move cross compile tests to their own jobs #8740

Job	Run time
fmt	11s
semver-checks	23s
check-msrv	8m 49s
python${{ matrix.python-version }}-${{ matrix.platform.python-architecture }} ${{ matrix.platform.os }} rust-${{ matrix.rust }}	0s
careful	0s
clippy/x86_64-apple-darwin/stable	14m 2s
docsrs	0s
clippy/x86_64-unknown-linux-gnu/stable	10m 13s
valgrind	0s
clippy/powerpc64le-unknown-linux-gnu/stable	10m 0s
coverage-windows	6s
clippy/s390x-unknown-linux-gnu/stable	9m 38s
coverage-macos	7s
test-debug	8m 38s
clippy/wasm32-wasi/stable	9m 22s
clippy/x86_64-pc-windows-msvc/stable	14m 46s
coverage-ubuntu	10m 52s
clippy/i686-pc-windows-msvc/stable	15m 50s
check-feature-powerset	0s
clippy/x86_64-unknown-linux-gnu/beta	9m 54s
emscripten	0s
test-cross-compilation ${{ matrix.os }} -> ${{ matrix.target }}	0s
test-version-limits	0s
test-cross-compilation-windows	0s
python3.12-x64 ubuntu-latest rust-stable / build	7m 44s
python3.12-x64 windows-latest rust-stable / build	13m 26s
python3.12-x64 macos-latest rust-stable / build	8m 24s
python3.12-x86 windows-latest rust-stable / build	12m 1s
python3.12-x64 ubuntu-latest rust-nightly / build	7m 2s
conclusion	1s
	2h 51m 29s

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