Added option --error-on-failed-ordering

[mrbean-bremen]

• makes tests error that cannot be ordered
• closes Optionally fail tests if order cannot be achieved [enhancement] #140
• also replaced old format() by f-strings

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.50%. Comparing base (19dae40) to head (d9bb23b).
Report is 37 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #141      +/-   ##
==========================================
+ Coverage   97.21%   98.50%   +1.28%     
==========================================
  Files           5        5              
  Lines         575      601      +26     
  Branches      136      145       +9     
==========================================
+ Hits          559      592      +33     
+ Misses          9        2       -7     
  Partials        7        7              

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