test: add known_issues test for fs.copyFile()
On macOS, fs.copyFile() may not respect file permissions. There is a PR for libuv that should fix this, but until it lands and we can either float a patch or upgrade libuv, have a known_issues test.
Ref: https://github.com/nodejs/node/issues/26936 Ref: https://github.com/libuv/libuv/pull/2233
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
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