[http-client-java] remove jsonrpc

[XiaofeiCao]

• Remove jsonrpc related code
• Explore alternatives for NewPlugin

[github-actions]

🎯 Issue Triage

This is a cleanup task to remove the jsonrpc code path from the http-client-java emitter, part of the broader autorest/swagger toolchain deprecation effort tracked in #11068.

Category: Feature Request
Area: emitter:client:java

🔍 Analysis

• This is a sub-task of epic [http-client-java] autorest generator code cleanup #11068 ("[http-client-java] autorest generator code cleanup"), which aims to remove old swagger/autorest-related code paths as that toolchain is being deprecated.
• Removing the jsonrpc support is a scoped cleanup task that reduces maintenance burden and code complexity.
• No duplicates found for this specific removal request.
• No reproduction code needed — this is a planned code removal task.

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