fix(jsonschema): parse discriminator properly

[tdakkota]

No description provided.

[codecov]

Codecov Report

Base: 73.70% // Head: 73.82% // Increases project coverage by +0.12% 🎉

Coverage data is based on head (31063c2) compared to base (56c1a52).
Patch coverage: 77.77% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #679      +/-   ##
==========================================
+ Coverage   73.70%   73.82%   +0.12%     
==========================================
  Files         172      172              
  Lines       12367    12455      +88     
==========================================
+ Hits         9115     9195      +80     
- Misses       2770     2778       +8     
  Partials      482      482              

Impacted Files	Coverage Δ
jsonschema/schema.go	100.00% <ø> (ø)
gen/schema_gen_sum.go	70.56% <46.00%> (-2.13%)	⬇️
jsonschema/parser.go	85.01% <93.82%> (+1.58%)	⬆️
jsonschema/resolve.go	80.00% <100.00%> (+17.50%)	⬆️
openapi/parser/parse_schema.go	100.00% <100.00%> (ø)
schema_backcomp.go	93.00% <100.00%> (+0.07%)	⬆️
jsonschema/external.go	50.63% <0.00%> (+2.53%)	⬆️
jsonschema/errors.go	89.65% <0.00%> (+10.34%)	⬆️
... and 1 more

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