inconsistent use of IChangeTokenProvider and ICancellationTokenProvider

[nshCore]

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We have two classes ChangeTokenProvider and CancellationTokenProvider, that provide wrapped functionality around cancellation tokens, the rationale behind the creation of these was to provide an easier and unified way of testing and mocking cancellation tokens.

Within the code we still use raw Microsoft.Extensions.Primitives.CancellationChangeToken and System.Threading.CancellationTokenSource. These can be replaced with ICancellationTokenProvider and IChangeTokenProvider.

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