feat(shell): add unset command #10770

Job	Run time
Testing chores	1m 57s
Build artifacts	1m 12s
ubuntu-latest w/ Node.js 18.x (1/2)	6m 0s
Big-endian debian w/ Node.js latest (${{ matrix.shard }})	0s
ubuntu-latest w/ Node.js 18.x (2/2)	5m 12s
ubuntu-latest w/ Node.js 19.x (1/2)	6m 12s
ubuntu-latest w/ Node.js 19.x (2/2)	5m 13s
ubuntu-latest w/ Node.js 20.x (1/2)	5m 34s
ubuntu-latest w/ Node.js 20.x (2/2)	4m 47s
ubuntu-latest w/ Node.js 21.x (1/2)	5m 3s
ubuntu-latest w/ Node.js 21.x (2/2)	4m 25s
ubuntu-latest w/ Node.js 22.x (1/2)	5m 10s
ubuntu-latest w/ Node.js 22.x (2/2)	4m 29s
windows-latest w/ Node.js 18.x (1/3)	5m 51s
windows-latest w/ Node.js 18.x (2/3)	11m 44s
windows-latest w/ Node.js 18.x (3/3)	6m 9s
macos-latest w/ Node.js 18.x (1/3)	2m 15s
macos-latest w/ Node.js 18.x (2/3)	3m 28s
macos-latest w/ Node.js 18.x (3/3)	2m 32s
windows-latest w/ Node.js 22.x (1/3)	5m 35s
windows-latest w/ Node.js 22.x (2/3)	8m 50s
windows-latest w/ Node.js 22.x (3/3)	6m 25s
macos-latest w/ Node.js 22.x (1/3)	2m 9s
macos-latest w/ Node.js 22.x (2/3)	3m 7s
macos-latest w/ Node.js 22.x (3/3)	3m 36s
	1h 56m 55s

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