Backport of allocrunner: provide factory function so we can build mock ARs into release/1.3.x #17172
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Backport
This PR is auto-generated from #17161 to be assessed for backporting due to the inclusion of the label backport/1.3.x.
WARNING automatic cherry-pick of commits failed. Commits will require human attention.
The below text is copied from the body of the original PR.
Tools like the
nomad-nodesim
are unable to implement a minimal implementation of an allocrunner so that we can test the client communication without having to lug around the entire allocrunner/taskrunner code base. The allocrunner was implemented with an interface specifically for this purpose, but there were circular imports that made it challenging to use in practice.Move the
AllocRunner
interface into an inner package and provide a factory function type. Provide a minimal test that exercises the new function so that consumers have some idea of what the minimum implementation required is.