Add Run all tests except .... configuration in CI job
Our CI jobs take way too long (1000+ tests) despite heroic efforts to use ApexMocks. As our org contains a bunch of unmanaged packages with known class name prefixes, and these constitute at least 10% of the total tests; we could get back 10% of our life if we could exclude these from the "run only your tests"
For example, we would want to exclude running any tests in classes that start with "fflib" and "sfab"
A variation of this would be to run a specific testSuite and it would be our responsibility to keep the testsuite up to date