refactor: extract check command into its own module #535

Job	Run time
Test install.ps1 (Windows ARM64)	55s
Test install.sh (readonly shell config)	8s
Test install.sh (Linux x64 musl)	19s
Test install.sh (Linux ARM64 musl via QEMU)	1m 26s
Test install.ps1 (Windows x64, PowerShell 7.6)	59s
Test install.ps1 (Windows x64, PowerShell 5.1)	38s
Test install.sh (Linux ARM64 glibc via QEMU)	2m 43s
Test install.sh (Linux x64 glibc)	15s
Test install.sh (macOS x64)	32s
Test vp-setup.exe (pwsh)	4m 47s
Test install.sh (macOS ARM64)	26s
Test install.ps1 (minimum-release-age)	17s
Test install.ps1 (Windows x64)	57s
	14m 22s

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