build: test-driver.scm: Output singleton metadata just once.

Current implementation printed metadata supposed to be present just once per
.trs file on the end of each test group.  According to the automake's manual
that is undefined behavior.  This commit fixes it by printing that metadata
just once, after all tests did run.

Since there is no built-in hook that could be used for
that (test-runner-on-final runs on *each* outermost test-end), I introduced
new `finalize' procedure that need to be called by the user.  Possibly not the
most elegant solution, but since we are the only user, it works fine and
produces actually valid .trs file.

That also means there is no longer any use for test-runner-on-test-end!.

* build-aux/test-driver.scm (test-runner-gnu): Define new procedure `finalize'
and return it together with the runner.  Do not call
test-runner-on-group-end!.
(main): Call the `finalize' after all tests are done.

Signed-off-by: Maxim Cournoyer <maxim@guixotic.coop>

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