Fix fortran openmp linking problem in examples/tests

We cannot link directly to `axom` instead of the underlying component (`slic` for example) in examples or tests due to the wrong openmp link flag showing up. This affects users as well.

I swapped over as many internal executables in this PR but fortran ones specifically could not be moved over: #580

Start by comparing the Fortran executables in the examples and tests with the internal executable changes described in pull request #580. Trace how the OpenMP link flag is selected when linking directly to axom versus the underlying component such as slic. Done means the Fortran examples and tests link through axom correctly without exposing the wrong OpenMP flag.

Written by the indexing model from the issue text.