simplify validation process

[mohd-afeef-badri]

• solution-comparision-file triggers the validation process.
• remove validation file from from input .arc file. Validation trigger is exclusive via TUI parameter -A,//fem/solution-comparison-file=FILENAME

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.32%. Comparing base (447eae0) to head (2f937f9).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #329      +/-   ##
==========================================
+ Coverage   69.28%   69.32%   +0.04%     
==========================================
  Files         118      118              
  Lines       14584    14567      -17     
  Branches     1987     1976      -11     
==========================================
- Hits        10104    10099       -5     
  Misses       4015     4015              
+ Partials      465      453      -12     

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