bug#49309: Feature Request: Automake script based tests to print the test name before running it

[Kasper k]

Hello automake devs,

In script based testsuites 
(https://www.gnu.org/software/automake/manual/html_node/Scripts_002dbased-Testsuites.html#Scripts_002dbased-Testsuites),
 when we run `make check` it prints one of the following string for each test: 
PASS <testname>, FAIL <testname>, XFAIL <testname> or SKIP <testname>.

However, in some cases (long running test, flaky test, other inconclusive ones 
for more involved reasons), it is essential to know which test is currently in 
flight. Especially in CI systems, where flakiness every now and then, due to 
external factors, is almost unavoidable.

It would be very helpful if a new option AM_TESTS_NAME=1 is provided, which 
would change the stdout output from:

    <blank stdout and wait for test execution to complete>
     PASS (or FAIL/XFAIL/SKIP) $name

to something like:

    RUNNING $name
    <blank stdout and wait for test execution to complete>
     PASS (or FAIL/XFAIL/SKIP) $name

this way we can easily find out the name of test (or multiple of them; in case 
of parallel execution) which is (are) currently running.

Thanks,
/K