Migrate Azure.AI.Language.QuestionAnswering.Authoring to new generator

[Copilot]

Description

Migrates Azure.AI.Language.QuestionAnswering.Authoring from the legacy TypeSpec C# emitter (@azure-tools/typespec-csharp) to the new Azure generator (@azure-typespec/http-client-csharp).

Changes

• tsp-location.yaml: Updated emitter path to eng/azure-typespec-http-client-csharp-emitter-package.json
• csproj: Removed IncludeAutorestDependency, System.Text.Json reference, and AZC0012 suppression
• Generated code: Regenerated via tsp-client update
• Removed obsolete customizations: Deleted files using internal legacy generator attributes (CodeGenType, CodeGenModel, CodeGenSuppress)
• Added workarounds for generator gaps:
  • ImportContentType.cs - Missing type referenced by generated convenience methods
  • ImportJobOptions.cs - Missing FileUri property
  • QuestionAnsweringAuthoringClientCustomizations.cs - Helper overloads for Import operations
• Updated client customization: Removed legacy attributes, updated to use Pipeline property

All existing tests pass (25 passed, 9 skipped live tests).

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• Please add REST spec PR link to the SDK PR
• I have read the contribution guidelines.
• The pull request does not introduce breaking changes.

General Guidelines

• Title of the pull request is clear and informative.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

SDK Generation Guidelines

• If an SDK is being regenerated based on a new swagger spec, a link to the pull request containing these swagger spec changes has been included above.
• The generate.cmd file for the SDK has been updated with the version of AutoRest, as well as the commitid of your swagger spec or link to the swagger spec, used to generate the code.
• The *.csproj and AssemblyInfo.cs files have been updated with the new version of the SDK.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Migrate Azure.AI.Language.QuestionAnswering.Authoring to new generator</issue_title>
<issue_description>https://github.com/Azure/azure-sdk-for-net/tree/main/sdk/cognitivelanguage/Azure.AI.Language.QuestionAnswering.Authoring

See https://github.com/Azure/azure-sdk-for-net/tree/main/sdk/documentintelligence/Azure.AI.DocumentIntelligence as an example.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Migrate Azure.AI.Language.QuestionAnswering.Authoring to new generator #54328

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Pull request overview

This PR successfully migrates Azure.AI.Language.QuestionAnswering.Authoring from the legacy TypeSpec C# emitter to the new Azure generator (@azure-typespec/http-client-csharp). The migration updates the emitter path, regenerates code with the new generator, removes obsolete legacy customizations, and adds targeted workarounds for generator gaps.

Key Changes

• Updated emitter configuration to use the new Azure TypeSpec generator
• Removed legacy customization files using deprecated CodeGenModel, CodeGenType, and CodeGenSuppress attributes
• Added workaround files (ImportContentType.cs, ImportJobOptions.cs, QuestionAnsweringAuthoringClientCustomizations.cs) to address generator gaps
• Updated client to use Pipeline property instead of _pipeline field
• Regenerated all models with new serialization patterns using _additionalBinaryDataProperties instead of _serializedAdditionalRawData

Reviewed changes

Copilot reviewed 12 out of 146 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tsp-location.yaml	Updated emitter package path and commit reference
QuestionAnsweringAuthoringClient.cs	Changed _pipeline field to Pipeline property
QuestionAnsweringAuthoringClientCustomizations.cs	Added helper overloads for Import operations
ImportContentType.cs	New workaround for missing content type referenced by convenience methods
ImportJobOptions.cs	Placeholder for missing FileUri property (workaround)
QuestionAnsweringAuthoringError*.cs	Removed - now generated by new emitter
Generated/Models/*	Regenerated with new serialization patterns and ResponseError instead of custom error types
Generated/QuestionAnsweringAuthoringClient.RestClient.cs	New protocol layer implementation

[github-actions]

API Change Check

APIView identified API level changes in this PR and created the following API reviews

Azure.AI.Language.QuestionAnswering.Authoring