Change Details

The `EchoNotificationJob` contains non-scalar value in it's parameters, the `event` property is an instance of `EchoEvent`, thus it's serialization relies on the redis-base JobQueue ability to use PHP serialization. The kafka-based queue deliberately doesn't support PHP serialization and requires all the jobs to be JSON-serializable per T161647, so the `EchoNotificationJob` job should be changed and made JSON-serializable.

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