Enable unit tests in ADIOS2 static CI build

[vicentebolea]

Extracted from #3749

This PR enables two static builds for ADIOS2 however they do not build the adios2 unittests, the reason is that each of our unit test is built in a single file, meaning that when enabling all the common options we build over 200 binaries. When we do a static build this is a problem since each of this binary will have the same size as the sum of all its dependencies. This result in Github actions returning a out-of-space error.

In order to enable tests in the static build we must group the tests in a single (or a few) binaries with the cmake function create_test_sourcelist https://cmake.org/cmake/help/book/mastering-cmake/chapter/Testing%20With%20CMake%20and%20CTest.html

Originally posted by @vicentebolea in #3749 (comment)