win,fs: improve realpathSync performance

[bartbrzo]

Moving knownHard object improves realpathSync perfomance.
This results in require being 10% faster on Windows and
realpathSync itself 50x faster.
Ref: #28946

..>cat results.csv | Rscript compare.R
                                                       confidence improvement accuracy (*)      (**)     (***)
 fs\\bench-realpath.js pathType='relative' n=10000                     0.79 %      A±2.99%   A±3.98%   A±5.19%
 fs\\bench-realpath.js pathType='resolved' n=10000              *      2.29 %      A±2.26%   A±3.00%   A±3.91%
 fs\\bench-realpathSync.js pathType='relative' n=10000        ***   5178.34 %     A±81.16% A±109.38% A±145.22%
 fs\\bench-realpathSync.js pathType='resolved' n=10000        ***   6179.63 %     A±72.30%  A±97.45% A±129.37%

• make -j4 test (UNIX), or vcbuild test (Windows) passes

[bzoz]

CI: https://ci.nodejs.org/job/node-test-pull-request/31918/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/31918/

[mscdex]

I don't think this is the correct solution to the performance problem as this will create a leak since knownHard is never reset in this PR.

[mscdex]

Additionally hard links may disappear during the lifetime of the process, giving incorrect results if knownHard contains stale information.

[github-actions]

This issue/PR was marked as stalled, it will be automatically closed in 30 days. If it should remain open, please leave a comment explaining why it should remain open.

[github-actions]

Closing this because it has stalled. Feel free to reopen if this PR is still relevant, or to ping the collaborator who labelled it stalled if you have any questions.