Fix [[nodiscard]] placement for Clang compilation

[mohd-afeef-badri]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.52%. Comparing base (a4dc414) to head (11dbdec).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
femutils/FemUtils.h	0.00%	4 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (50.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #321   +/-   ##
=======================================
  Coverage   69.52%   69.52%           
=======================================
  Files         114      114           
  Lines       14487    14487           
  Branches     1974     1974           
=======================================
  Hits        10072    10072           
  Misses       3967     3967           
  Partials      448      448           

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