gh-150880: Clarify DirEntry.path construction semantics (GH-153218) #2379

Job	Run time
aarch64-unknown-linux-gnu/gcc	6m 20s
x86_64-unknown-linux-gnu/gcc	10m 53s
aarch64-apple-darwin/clang	9m 47s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 1s
x86_64-apple-darwin/clang	40m 32s
	1h 15m 33s

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