Remove StandardLibraryHandler method from TestFramework interface

[m-Peter]

Closes #2898

Description

This method is no longer needed as part of the TestFramework interface, We remove it so that downstream dependencies (test providers) are not forced to implement it.

Note: I will follow-up with the necessary changes on the cadence-tools/test repository, to complete the removal of this method.

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• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bc259b2) 79.43% compared to head (8c4ac61) 79.43%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2927   +/-   ##
=======================================
  Coverage   79.43%   79.43%           
=======================================
  Files         332      332           
  Lines       79111    79111           
=======================================
  Hits        62842    62842           
  Misses      13958    13958           
  Partials     2311     2311           

Flag	Coverage Δ
unittests	79.43% <ø> (ø)

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