Operations should unsubscribe from Hub events on cancel

[brennanMKE]

Is your feature request related to a problem? Please describe.

An operation can be canceled. The tokens for subscribing to events using the Hub only unsubscribe when a result is received. The cancel function does not unsubscribe currently in AmplifyOperation or AmplifyInProcessReportingOperation. When an operation is cancelled it should not be receiving any new values.

Describe the solution you'd like

Cancel also unsubscribes.

Describe alternatives you've considered

None

Is the feature request related to any of the existing Amplify categories?

Analytics, API, Auth, DataStore, Geo, Predictions, Storage

Additional context

No response

[github-actions[bot]]

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[github-actions[bot]]

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