[MNG-5445] extract StringSearchModelInterpolator issue into local IT plugin rather than rely on external versions-maven-plugin
[MNG-5445] restrict new test to 3.1.x stream (assumes the fix isn't going to be backported to 3.0.x, note that the test itself requires a minimum of 2.1.0 for the additional path-related ModelInterpolator methods)
Merge branch 'MNG-5445-fix-it-deps'