feat(prune): add `--use-gitignore` flag #3906

Job	Run time
Find path changes	4s
Turborepo rust check	1m 27s
Turborepo Rust testing on ubuntu	1m 48s
Turborepo Integration (ubuntu-latest)	5m 4s
Turborepo Rust testing on macos	9m 38s
Turborepo Integration (macos-13)	20m 21s
Rust lints	1m 33s
Turborepo Rust testing on windows	13m 24s
Turborepo Integration (windows-latest)	23m 48s
`basic` example	0s
`kitchen-sink` example	0s
`non-monorepo` example	0s
`with-svelte` example	0s
`with-tailwind` example	0s
Turborepo Test Summary	1s
Cleanup / cleanup	4s
	1h 17m 12s

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