Pass ModelReaderWriterContext in generated TryResolve{Property}Array helpers

[Copilot]

The TryResolve{Property}Array helpers were emitting ModelReaderWriter.Write(collection, options) without the ModelReaderWriterContext argument, breaking AOT-trimmed builds (e.g. OpenAI) where the context-less overload isn't preserved.

Changes

• ModelReaderWriterOptionsSnippets.cs: Added a new JsonFormatProperty snippet that returns the ModelReaderWriterOptions.Json static property.
• MrwSerializationTypeDefinition.Dynamic.cs: In BuildTryResolveArrayMethod, append ModelReaderWriterContextSnippets.Default to the ModelReaderWriter.Write invocation, mirroring the pattern already used in BuildPersistableModelWriteCoreMethodBody and the XML serialization path. Also simplified the options argument to use the new ModelReaderWriterOptionsSnippets.JsonFormatProperty snippet instead of new ModelReaderWriterOptions("J").
• Test baseline: Update PropagateModelListPropertyHelperMethods.cs to expect the third argument and the ModelReaderWriterOptions.Json static.

Generated output now matches the rest of the emitter:

global::System.BinaryData data = global::System.ClientModel.Primitives.ModelReaderWriter.Write(
    ActiveP1(),
    global::System.ClientModel.Primitives.ModelReaderWriterOptions.Json,
    global::Sample.SampleContext.Default);

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commit: e43c738

[jorgerangel-msft]

@copilot there are CI failures. We need to regenerate all the test libraries and ensure all tests pass

[Copilot]

@copilot there are CI failures. We need to regenerate all the test libraries and ensure all tests pass

Regenerated the test libraries in e43c738 — Sample-TypeSpec's DynamicModel.Serialization.cs now emits the context argument and ModelReaderWriterOptions.Json. The project builds and the full generator test suite passes (1343 ClientModel tests + Spector tests, 0 failures).