test(datastore): fix observe query integration test

[5d]

Issue #

Description

• stablize integration test cases of observe query
  • unsubscribe to datastore publisher when test case is finished
  • use new fulfillment async API

General Checklist

• [ ] Added new tests to cover change, if needed
• [ ] Build succeeds with all target using Swift Package Manager
• [X] All unit tests pass
• [X] 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
• [X] 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.