[turbopack] Rename variables in `path_join` and add tests (#94625) #8054

Job	Run time
Determine changes	12s
validate-docs-links	15s
optimize-ci / Graphite CI Optimizer	4s
build-next / build	1d 0h 0m 0s
Upload PR CI metadata	-9s
fetch test timings	54s
build-native / build	1d 0h 0m 0s
test devlow package / build	1d 0h 0m 0s
build-native-windows / build	1d 0h 0m 0s
rustdoc check	-1s
test next-swc wasm	-1s
ast-grep lint	-1s
rust check	-1s
test cargo unit	-1s
test next-swc wasi	-1s
lint	-1s
test cargo benches	-1s
test turbopack production	0s
Test new and changed tests for flakes (dev)	0s
test unit	0s
test prod windows	0s
test unit windows	0s
test rspack production	0s
test dev windows	0s
test next-config-ts-native-ts dev	0s
test rspack dev	0s
test cache components dev	0s
test turbopack dev	0s
thank you, next	2s
test prod	0s
test integration windows	0s
test next-config-ts-native-ts prod	0s
Test new and changed tests for flakes (prod)	0s
test dev	0s
types and precompiled	0s
test firefox and safari	0s
test cache components prod	0s
Run devlow benchmarks	0s
Test new and changed tests when deployed (cache components)	0s
Test new and changed tests when deployed	0s
	4d 0h 1m 10s

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