refactor: Updated shim classes to no longer construct specs.

[bizob2828]

Description

I couldn't remove all the construction of specs in shim because at some point that are deriving existing specs to do something else.

Related Issues

Closes #2037

[codecov]

Codecov Report

Attention: Patch coverage is 99.38272% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 97.20%. Comparing base (df2a0fd) to head (4801de0).

❗ Current head 4801de0 differs from pull request most recent head 6fc4584. Consider uploading reports for the commit 6fc4584 to get more accurate results

Files	Patch %	Lines
lib/instrumentation/mongodb/common.js	96.96%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2096      +/-   ##
==========================================
- Coverage   97.21%   97.20%   -0.01%     
==========================================
  Files         251      251              
  Lines       42392    42317      -75     
==========================================
- Hits        41210    41133      -77     
- Misses       1182     1184       +2     

Flag	Coverage Δ
integration-tests-16.x	78.30% <35.13%> (+0.05%)	⬆️
integration-tests-18.x	78.27% <35.13%> (+0.03%)	⬆️
integration-tests-20.x	78.27% <35.13%> (+0.04%)	⬆️
unit-tests-16.x	90.44% <99.12%> (-0.16%)	⬇️
unit-tests-18.x	90.35% <99.12%> (-0.23%)	⬇️
unit-tests-20.x	90.35% <99.12%> (-0.23%)	⬇️
versioned-tests-16.x	74.48% <79.01%> (-0.05%)	⬇️
versioned-tests-18.x	75.60% <79.01%> (-0.05%)	⬇️
versioned-tests-20.x	75.60% <79.01%> (-0.05%)	⬇️

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[jsumners-nr]

Looks good to me.