fix(gen): check enum value type before generating

[tdakkota]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 28 lines in your changes missing coverage. Please review.

Project coverage is 72.74%. Comparing base (34afe31) to head (e2dc75e).
Report is 20 commits behind head on main.

Files with missing lines	Patch %	Lines
gen/schema_gen_primitive.go	41.86%	23 Missing and 2 partials ⚠️
gen/schema_gen.go	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1322      +/-   ##
==========================================
- Coverage   73.92%   72.74%   -1.18%     
==========================================
  Files         189      190       +1     
  Lines       12855    13096     +241     
==========================================
+ Hits         9503     9527      +24     
- Misses       2804     3017     +213     
- Partials      548      552       +4     

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