http-client-java, escape javadoc for \u

[weidongxu-microsoft]

fix Azure/autorest.java#3005

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[azure-sdk]

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[Copilot]

Pull Request Overview

Adds support for a new domainUsername property in the Java HTTP client model and ensures that backslash-unicode sequences in Javadoc are correctly escaped.

• Introduces domainUsername in the TSP schema and propagates it through the generated model, serializers, and client docs.
• Implements CodeNamer.escapeIllegalUnicodeEscape to catch invalid \u sequences and plugs it into line and Javadoc comment generation.
• Adds unit tests for the new escape logic in CodeNamerTests.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
naming.tsp	Defined a new domainUsername property with a backslash in its doc string.
DataResponse.java	Added domainUsername field, constructor parameter, getter, and JSON (de)serialization handling.
NamingOpsImpl.java	Updated operation documentation to include domainUsername.
NamingAsyncClient.java	Updated async client Javadoc to include domainUsername.
CodeNamerTests.java	Added tests for escapeIllegalUnicodeEscape.
CodeNamer.java	Implemented escapeIllegalUnicodeEscape and factored out newStringBuilder.
JavaLineComment.java	Plugged escapeIllegalUnicodeEscape into line comments.
JavaJavadocComment.java	Plugged escapeIllegalUnicodeEscape into Javadoc comments.

Comments suppressed due to low confidence (1)

packages/http-client-java/generator/http-client-generator-test/src/main/java/tsptest/naming/models/DataResponse.java:166

• Add unit tests to verify serialization and deserialization of the new domainUsername property on DataResponse (including null and special characters) to prevent regressions.

jsonWriter.writeStringField("domainUsername", this.domainUsername);