chore: fix analytics integration test - #4189

Issue #

Failing tests
https://github.com/aws-amplify/amplify-swift/actions/workflows/integ_test.yml

Description

This PR updates the testIdentifyUser() test to use a unique userId as we were getting limits hit.

BadRequestException: Exceeded maximum endpoint per user count: 15

https://docs.aws.amazon.com/pinpoint/latest/userguide/segments-troubleshooting.html#troubleshooting-badrequestexception

General Checklist

• Added new tests to cover change, if needed
• Build succeeds with all target using Swift Package Manager
• All unit tests pass
• All integration tests pass
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Documentation update for the change if required
• PR title conforms to conventional commit style
• New or updated tests include Given When Then inline code documentation and are named accordingly testThing_condition_expectation()
• If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.