Onboard sync stack for Identity package

[maximrytych-ms]

Description

Onboarded sync stack:

• CommunicationIdentitiesImpl regenerated with new sync overloads
• Test updated with AssertingHttpClientBuilder to assert a/sync processing
• Updated test records

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.

[azure-sdk]

API change check

API changes are not detected in this pull request.

[AikoBB]

/azp run java - azure-communication-identity - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[AikoBB]

lgtm, though tests need refactoring...pls mentions the issue in your PR and let the eng.sys team that the work is completed for communication-identity package