Refactor tests which use JuMPExtension.jl

[odow]

I started looking into #1711

This is a preliminary step to making the JuMPExtension tests more widely accessible. For a start, we need to know which tests to make available, and to have a standardized call signature for them.

I still need to figure out exactly what it would look like. Perhaps we could put them all in a separate submodule of the tests/JuMPExtensionTests and then packages could run

include(joinpath(pathof(JuMP), "test", "JuMPExtensionTests", "JuMPExtensionTests.jl")

[codecov]

Codecov Report

Base: 97.70% // Head: 97.70% // No change to project coverage 👍

Coverage data is based on head (545ba21) compared to base (c57514d).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3162   +/-   ##
=======================================
  Coverage   97.70%   97.70%           
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  Files          33       33           
  Lines        4485     4485           
=======================================
  Hits         4382     4382           
  Misses        103      103           

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