[http-client-java] cleanup unnecessary Mapper(Factory)s

[XiaofeiCao]

We have many TypeSpecXXMapper(Factory)s. Since now We only have TypeSpec(azurev1, azurev2, clientcore), we should consolidate them into ones without TypeSpec prefix.

[github-actions]

🎯 Issue Triage

Cleanup/refactoring task to consolidate TypeSpecXXMapper(Factory) classes in the http-client-java emitter by removing the TypeSpec prefix, since target frameworks are now limited to azurev1, azurev2, and clientcore.

Category: Feature
Area: emitter:client:java

🔍 Analysis

• Affected component: packages/http-client-java — mapper and mapper factory classes
• Nature: Internal code cleanup with no external API impact expected
• Motivation: The TypeSpec prefix is redundant now that all mappers target TypeSpec-based frameworks exclusively; consolidating them reduces naming confusion
• Risk: Low — rename/consolidation of internal classes; no behavioral change expected

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