Integrate, test and demo cancelPromise

[cefn]

Currently the cancelPromise mechanism is there (in that cancelPromise options are provided and the value is passed in the invocation of a job.

The cancelPromise mechanism should be used and tested for two scenarios...

• The overall schedule is halted by the requester resolving the CancelPromise
• A timeout has expired, and the launched promise can therefore afford to give up.

However currently...

• Internal promises aren't co-wired to the cancelPromise (e.g. queue promises, launchesFinalized.promise, settlementsFinalized.promise)
• The timeout mechanism doesn't pass a job-invocation-specific cancelPromise (that composes with the global cancelPromise) meaning jobs will continue executing in the background and their results just ignored even when their specific timeout has expired
• There are no tests for the approach
• There are no demos of the approach