fs: defer path resolution in realpath functions

[Xstoudi]

In fs.realpath and fs.realpathSync, path resolution is now performed after symlink traversal instead of before, ensuring correct behavior when dealing with parent directory references (..) in paths containing symlinks.

Fixes: #60779

I may be unaware of full implications of this change, feel free to let me know if it's not the right way to fix it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.53%. Comparing base (15bdf38) to head (e2b2166).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #61194   +/-   ##
=======================================
  Coverage   88.53%   88.53%           
=======================================
  Files         703      703           
  Lines      208598   208601    +3     
  Branches    40227    40226    -1     
=======================================
+ Hits       184674   184683    +9     
+ Misses      15951    15939   -12     
- Partials     7973     7979    +6     

Files with missing lines	Coverage Δ
lib/fs.js	98.19% <100.00%> (+<0.01%)	⬆️

... and 31 files with indirect coverage changes

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