path: canonicalize Windows namespaced paths #7780

Job	Run time
Build slim tarball	2m 17s
aarch64-linux: Cache V8 build	23s
x86_64-darwin: with shared libraries	36m 49s
x86_64-linux: with shared libraries	28m 30s
aarch64-darwin: with shared libraries	26m 34s
aarch64-linux: with shared openssl-4.0.0	22m 29s
aarch64-linux: with shared openssl-3.5.6	22m 16s
aarch64-linux: with shared openssl-1.1.1w	22m 56s
aarch64-linux: with shared openssl-3.0.20	22m 24s
aarch64-linux: with shared boringssl-0.20260526.0	24m 6s
aarch64-linux: with shared openssl-3.6.2	23m 42s
	3h 52m 26s

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