fix(datastore): update pending mutation events version from mutation response

[5d]

Issue #

Description

• rollback the logic for updating the version of pending mutation events in the queue upon receiving a mutation response from the remote server with the same model id.
• detect the mutation event version based on both latest synced metadata and existing mutation event's version.

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.