chore(scm): gate git2 behind feature flag #4639

Job	Run time
Find path changes	4s
Turborepo Integration (ubuntu-latest)	7m 59s
`kitchen-sink` example	0s
`non-monorepo` example	0s
Turborepo Integration (macos-13)	21m 28s
`basic` example	0s
Turborepo Integration (windows-latest)	21m 44s
Turborepo rust check	4m 45s
Rust lints	5m 39s
Turborepo Rust testing on ubuntu	4m 45s
`with-svelte` example	0s
Turborepo Rust testing on macos	8m 53s
Turborepo Rust testing on windows	14m 57s
`with-tailwind` example	0s
Turborepo Test Summary	1s
Cleanup / cleanup	3s
	1h 30m 18s

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