fs: remove known issues test test-fs-cp-filter

[npaun]

This test isn't correct. In fact, both cp and cpSync have the same behaviour. filter is invoked twice, despite the comment saying it's invoked only once in cpSync.

[juanarbol]

Ping @nodejs/fs

[jasnell]

$ ./node test/known_issues/test-fs-cp-filter.js 
node:internal/errors:546
      throw error;
      ^

TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received an instance of Buffer
    at join (node:path:1339:7)
    at copyDir (node:internal/fs/cp/cp-sync:164:23)
    at onDir (node:internal/fs/cp/cp-sync:136:25)
    at getStats (node:internal/fs/cp/cp-sync:68:12)
    at cpSyncFn (node:internal/fs/cp/cp-sync:58:10)
    at cpSync (node:fs:3123:3)
    at Object.<anonymous> (/home/jsnell/projects/node/node/test/known_issues/test-fs-cp-filter.js:28:1)
    at Module._compile (node:internal/modules/cjs/loader:1737:14)
    at Object..js (node:internal/modules/cjs/loader:1870:10)
    at Module.load (node:internal/modules/cjs/loader:1469:32) {
  code: 'ERR_INVALID_ARG_TYPE'
}

I think this is still relevant.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.34%. Comparing base (7178e91) to head (ba909a0).
⚠️ Report is 46 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #59682      +/-   ##
==========================================
- Coverage   89.83%   89.34%   -0.49%     
==========================================
  Files         666      667       +1     
  Lines      195337   196850    +1513     
  Branches    38353    38343      -10     
==========================================
+ Hits       175474   175884     +410     
- Misses      12323    13336    +1013     
- Partials     7540     7630      +90     

see 134 files with indirect coverage changes

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