fix: Newtonsoft.Json.Schema -> JsonSchema.Net

[yufeih]

#4250

BREAKING CHANGE: JSON Schema $ref can only reference subschemas defined in the #/definitions/ section.

[codecov]

Codecov Report

Base: 77.10% // Head: 77.17% // Increases project coverage by +0.07% 🎉

Coverage data is based on head (cd2e4c9) compared to base (8252e5b).
Patch coverage: 96.49% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8418      +/-   ##
==========================================
+ Coverage   77.10%   77.17%   +0.07%     
==========================================
  Files         860      859       -1     
  Lines       30773    30696      -77     
==========================================
- Hits        23726    23690      -36     
+ Misses       7047     7006      -41     

Impacted Files	Coverage Δ
.../Microsoft.DocAsCode.App/Config/BuildJsonConfig.cs	88.37% <ø> (-0.27%)	⬇️
...ft.DocAsCode.App/Helpers/DocumentBuilderWrapper.cs	79.03% <ø> (-0.12%)	⬇️
....DocAsCode.Build.Engine/DocumentBuildParameters.cs	100.00% <ø> (ø)
src/docfx/Models/BuildCommandOptions.cs	97.14% <ø> (-0.08%)	⬇️
src/docfx/SubCommands/BuildCommand.cs	66.66% <ø> (-0.18%)	⬇️
...AsCode.Build.SchemaDriven/Models/DocumentSchema.cs	83.75% <93.93%> (+11.10%)	⬆️
...icrosoft.DocAsCode.Build.Engine/DocumentBuilder.cs	74.87% <100.00%> (-0.63%)	⬇️
....DocAsCode.Build.SchemaDriven/Models/BaseSchema.cs	100.00% <100.00%> (ø)
...Code.Build.SchemaDriven/SchemaFragmentsIterator.cs	81.39% <100.00%> (ø)
...e.Build.SchemaDriven/Validators/SchemaValidator.cs	100.00% <100.00%> (+15.00%)	⬆️
... and 7 more

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