Possible fix for Execution Timeout issues seen on Build Server

[nathanwoctopusdeploy]

Background

Possible fix for Execution Timeout issues seen on Build Server

• Wait.For now requires a specific timeout to avoid waiting for too long / never finishing the wait if the CancellationToken fails to be cancelled
• IntegrationTest will now attempt to cancel the cancellation token just before the test times out. Nunit does not call TearDown on the test if it times out through the TimeoutAttribute so we end up in a state where the CancellationToken used for test cleanup is not cancelled and things can keep running.

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