Split scarb-execute into subfiles #8598

Job	Run time
build test linux x86-64	3m 3s
build test windows x86-64	7m 55s
scarb-metadata compatibility check	40s
check-rust	3m 49s
snforge-init	7m 8s
test prebuilt plugins linux x86-64	6m 15s
doc tests	3m 50s
check-website	19s
test prebuilt plugins windows x86-64	7m 59s
test prebuilt plugins macos arm64	3m 36s
test prebuilt plugins macos x86-64	6m 7s
test linux x86-64 1/4	45m 28s
test linux x86-64 2/4	55m 18s
test linux x86-64 3/4	43m 57s
test linux x86-64 4/4	38m 13s
test windows x86-64 1/4	42m 10s
test windows x86-64 2/4	46m 58s
test windows x86-64 3/4	40m 9s
test windows x86-64 4/4	32m 57s
	6h 35m 51s

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