Add spack test support to resolve package.py

[cameronrutherford]

Also add this test to CI pipelines

[pelesh]

@cameronrutherford, could you please elaborate on this issue?

[cameronrutherford]

@pelesh depending on what type of tests are appropriate, I suggest all spack packages add tests.

https://spack.readthedocs.io/en/latest/packaging_guide.html#checking-an-installation

For resolve, I think a build time run of the unit tests might be nice to verify things work before installing.

Post install tests allow people to run tests against existing installations of packages, and so those are often the most useful ones IMO. They allow you to run tests against installed software without needing the build stage. Great for testing binaries you install from a cache / binaries installed previously.