[http-client-java] make stream-style-serialization the only serialization method

[XiaofeiCao]

[github-actions]

🎯 Issue Triage

A sub-task of the autorest cleanup epic (#11068), requesting that stream-style serialization becomes the sole serialization method in the Java client emitter, removing the legacy Jackson-based code path.

Category: Feature Request
Area: emitter:client:java

🔍 Analysis

• This is a child task under the autorest generator code cleanup effort ([http-client-java] autorest generator code cleanup #11068), which aims to deprecate the autorest toolchain
• The Java client emitter currently supports multiple serialization methods; the goal is to consolidate on stream-style serialization (azure-json based) and drop the older Jackson-based approach
• This is an internal refactoring/cleanup that reduces maintenance surface and aligns with the migration away from autorest/Jackson
• No duplicate issues found covering the same specific serialization cleanup task
• No reproduction code needed — this is a planned engineering task, not a bug report

📝 Suggested next steps

• Identify all code paths in http-client-java that use the non-stream-style serialization
• Remove or replace Jackson-dependent serialization logic with stream-style equivalents
• Update/add tests to verify serialization behavior is preserved under stream-style only
• Ensure the change is captured in a changelog entry

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