http-client-java, support crossLanguageVersion

[weidongxu-microsoft]

Clear and concise description of the problem

likely need new TCGC 0.68.0

output crossLanguageVersion to metadata.json file.

Checklist

• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[github-actions]

🎯 Issue Triage

Feature request to output crossLanguageVersion to the metadata.json file in the Java client emitter, likely requiring an upgrade to TCGC 0.68.0.

Category: Feature Request
Area: emitter:client:java

🔍 Analysis

• The request is to surface the crossLanguageVersion field (introduced or updated in TCGC 0.68.0) into the emitted metadata.json file.
• This requires consuming the new TCGC version and wiring the crossLanguageVersion value through the Java emitter's metadata output.
• No reproduction code is applicable for a feature request of this nature.

📝 Suggested next steps

• Upgrade @azure-tools/typespec-client-generator-core dependency to ≥ 0.68.0 in http-client-java.
• Locate the metadata.json generation code and add the crossLanguageVersion field.
• Add/update tests to verify the field appears in emitted metadata.

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