Refactor integration test code internals for program invocation

In the future we will need to perform a sequence of invocations of the
program for testing purposes, with each having a slightly different
execution context. Such a scheme does not map very well to the existing
design where we essentially just have a function invocation to run the
program. We would either have functions that produce a different
execution context or pass in the data to modify.
Neither of these approaches is appealing and so this change reworks the
code slightly. With it, we now can create a Nitrocli object, which
contains the data that diverges from the default execution context. This
data will eventually be modifiable by callers.

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