Add Communication Identity service version 2026-09-23

[John Fraser (JohnRFraser)]

Description

Adds Communication Identity service version 2026-09-23 so clients use the new API version by default while retaining explicit access to prior supported versions.

The change extends CommunicationIdentityServiceVersion, updates getLatest(), and adds sync and async transport-level tests that verify the default api-version=2026-09-23 query parameter.

The targeted builder test suite passes with 19 tests. The full playback suite is currently blocked by the local test proxy using an invalid recording path and refusing connections on port 5000.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

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Pull request overview

Adds Communication Identity service version 2026-09-23 as the default while retaining prior versions.

Changes:

• Adds the new service version and updates getLatest().
• Adds sync and async default-version tests.
• Updates the changelog.

File summaries

File	Description
sdk/communication/azure-communication-identity/src/test/java/com/azure/communication/identity/CommunicationIdentityBuilderUnitTests.java	Verifies default API-version requests.
sdk/communication/azure-communication-identity/src/main/java/com/azure/communication/identity/CommunicationIdentityServiceVersion.java	Adds and selects the new service version.
sdk/communication/azure-communication-identity/CHANGELOG.md	Documents the new default version.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 0
• Review effort level: Lite

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