test: use case-insensitive path checking on Windows in fs.cpSync tests

[joyeecheung]

In certain machine configurations on Windows, fs.readlinkSync() may return a path with upper case drive letter while the other paths may be constructed from a base path with a lower case drive letter (e.g. from process.cwd()). Checking path mismatch in a case-sensitive manner can lead to failure in some tests, specifically with the Windows machine configurations in the Jenkins CI. Since paths are case-insensitive on Windows anyway, compare them in a case-insensitive manner in the tests.

This reduces the orange-ness of the Windows CI. I discovered it by logging the output in a test run

  process.env.NODE_TEST_DIR: undefined
  tmpdir.path: c:\workspace\node-test-binary-windows-js-suites\node\test\.tmp.337
  dest: c:\workspace\node-test-binary-windows-js-suites\node\test\.tmp.337\copy_%2
  src: c:\workspace\node-test-binary-windows-js-suites\node\test\.tmp.337\copy_%1
  join(dest, "a", "c") c:\workspace\node-test-binary-windows-js-suites\node\test\.tmp.337\copy_%2\a\c
  link: C:\workspace\node-test-binary-windows-js-suites\node\test\.tmp.337\copy_%1

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/68638/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.87%. Comparing base (af5d1c9) to head (0dace4f).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #59475      +/-   ##
==========================================
+ Coverage   89.35%   89.87%   +0.52%     
==========================================
  Files         656      656              
  Lines      192963   192963              
  Branches    37543    37852     +309     
==========================================
+ Hits       172417   173424    +1007     
+ Misses      13026    12093     -933     
+ Partials     7520     7446      -74     

see 99 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/68646/