Stop informers on context cancelation

[smira]

Without this fix, if the test runs within the same process (when using as a library), the informer will keep running forever after the test execution.

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[rjsadow]

Great catch, thanks for the PR!
/ok-to-test
/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rjsadow, smira

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