fix(gen): use response ref as key for wrapped type lookup

[tdakkota]

Fixes #1182

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (12082ad) 73.78% compared to head (6383038) 73.78%.
Report is 14 commits behind head on main.

Files	Patch %	Lines
gen/gen_responses.go	75.00%	0 Missing and 1 partial ⚠️
gen/tstorage.go	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1183   +/-   ##
=======================================
  Coverage   73.78%   73.78%           
=======================================
  Files         188      188           
  Lines       12659    12661    +2     
=======================================
+ Hits         9340     9342    +2     
  Misses       2785     2785           
  Partials      534      534           

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