test: migrate to `jest`, leverage asar header and unpacked dir snapshots, and get swoll 💪#355

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mmaietta wants to merge 13 commits intoelectron:mainfrom mmaietta:snapshot-tests

+3,658-465

Commits on Feb 9, 2025

disable fail-fast so that all test runners fully execute (in case there's variance between node versions)
mmaietta
committed
add helper test.if, ifWindows, and ifNotWindows function to retain snapshots when running on different OS's
mmaietta
committed

Commits on Feb 10, 2025