[http-client-java] remove unused settings

[XiaofeiCao]

• disable-required-property-annotation (affects generated @JsonProperty(required=true). since we now use stream-style, this setting is no longer needed)

[github-actions]

🎯 Issue Triage

This task tracks removing the unused disable-required-property-annotation emitter setting from http-client-java, which was previously used to control @JsonProperty(required=true) generation but is no longer needed now that the emitter uses stream-style serialization.

Category: Feature Request
Area: emitter:client:java

🔍 Analysis

• Setting: disable-required-property-annotation — controlled generation of @JsonProperty(required=true) annotations
• Reason for removal: Stream-style serialization no longer requires this annotation, making the setting obsolete
• Sub-issue of: [http-client-java] autorest generator code cleanup #11068
• Impact: Minor breaking change for users who may have this setting configured — should be documented or handled with a deprecation warning before full removal

📝 Suggested next steps

• Identify all references to disable-required-property-annotation in packages/http-client-java
• Remove the setting from the emitter options schema and code
• Add a changelog entry noting the removal (breaking change if publicly documented)
• Verify generated output for models with required properties is correct without the setting

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