[v9.x backport] fs: use fs.access in fs.exists
Uses fs.access to implement fs.exists functionality. Fixes a issue, when a file exists but user does not have privileges to do stat on the file.
Original PR: https://github.com/nodejs/node/pull/18618
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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