[http-client-java] autorest generator code cleanup

[XiaofeiCao]

We are deprecating autorest toolchain. Cleanup old swagger/autorest related code path.

[github-actions]

🎯 Issue Triage

This is a cleanup task to remove old Swagger/Autorest-related code paths from the http-client-java emitter as the Autorest toolchain is being deprecated.

Category: Task (Epic)
Area: emitter:client:java

🔍 Analysis

• This is a planned internal refactoring/cleanup effort, not a user-reported bug.
• The Autorest generator code paths in http-client-java are being deprecated and should be removed.
• Affected component: packages/http-client-java — specifically the Autorest/Swagger integration code paths.
• No reproduction needed; this is a proactive cleanup task.

📝 Suggested next steps

• Identify all Autorest/Swagger-related code paths in packages/http-client-java
• Verify no downstream consumers depend on these code paths before removal
• Remove deprecated code and update any related tests/docs

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