Revert "Move wrapper handle to shim" and add a regression test

[ObsidianMinor]

This reverts commit 2d08fd1.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.27273% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.31%. Comparing base (8352890) to head (f027730).

Files with missing lines	Patch %	Lines
src/workerd/jsg/wrappable.c++	79.06%	3 Missing and 6 partials ⚠️
src/workerd/jsg/isolate-shutdown-test.c++	93.02%	0 Missing and 3 partials ⚠️
src/workerd/jsg/setup.c++	88.88%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7227      +/-   ##
==========================================
- Coverage   37.32%   37.31%   -0.02%     
==========================================
  Files         801      801              
  Lines      251478   251435      -43     
  Branches    20000    19981      -19     
==========================================
- Hits        93857    93815      -42     
- Misses     146250   146263      +13     
+ Partials    11371    11357      -14     

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