Add test.properties for all tests being pulled from external repositories

[smlambert]

We already employ this approach with tests added in the external group, but as we are bringing in tests to other groups where we pull from other repositories, there needs to be proper documentation of dependencies, prereqs, and good tracking of branches/tags/SHAs that were used.

We can do this with a simple test.properties file that discloses prereqs/dependencies, that TKG can read and also add the SHAs for what instance of test material in use. TKG should also exit early if dependencies are not present on the machine where the tests are about to be run.

Related:
#5134 (comment)

Also will help enable:
#5142