[semimikoh]

Use the existing source directory check instead of stat()ing the link target.

fs.cp() fails with ENOENT when a dangling source symlink replaces an existing symlink. This uses the already computed srcIsDir for the subdirectory check instead of calling stat(src), and adds a regression test.

The new regression test and the existing symlink protection test pass. The full test suite is still running.

Fixes: #66946

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.69%. Comparing base (768315c) to head (ff568e2).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #66948      +/-   ##
==========================================
- Coverage   90.69%   90.69%   -0.01%     
==========================================
  Files         797      797              
  Lines      279572   279571       -1     
  Branches    53778    53776       -2     
==========================================
- Hits       253569   253558      -11     
- Misses      16287    16299      +12     
+ Partials     9716     9714       -2     

Files with missing lines	Coverage Δ
lib/internal/fs/cp/cp.js	93.12% <100.00%> (-0.02%)	⬇️

... and 31 files with indirect coverage changes

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