testsuite: Ensure that makefile_tests are run

We currently use the test's func to determine whether it is a compile-time or a run-time test. This means that run_command tests and the like are considered to be neither run-time nor compile-time tests and only get run in the normal way. This is quite surprising (see #16042 (closed)) and has meant that some tests have gone silently un-run in the past. We now ensure that such tests are run by using all ways as the list of candidate ways for run_command and makefile_tests.