Improve CI testing of Axom's installed examples

[kennyweiss]

We began CI testing of a subset of our installed examples in PR #225. Specifically, we are now testing our using-with-cmake and using-with-blt examples for all CPU-based host-configs.

To further validate our installation, we should add CI testing of our installed examples to:

• [ ] Our using-with-make example. For this makefile-based example, we should generate a pkg-config file to capture the installed axom's build configuration, or generate an axom.mk file
• ~~Our azure CI-based plans (linux, mac and windows)~~
• [x] Our GPU-based LLNL host-configs
• [ ] Add a Fortran example

[gzagaris]

This sounds great!

[kennyweiss]

Conduit's conduit_config.mk is here: https://github.com/LLNL/conduit/blob/develop/src/config/conduit_config.mk.in