cogl/tests: Use less verbose run-tests.sh on single tests run by meson

Use less verbose output when run-tests.sh is running only a test and we're
requested for less verbose output.

Also write the test name first of running it.

GNOME/mutter!442
3 jobs for !442 with meson-test-suites in 5 minutes and 25 seconds (queued for 2 seconds)
detached
Status Job ID Name Coverage
  Review
passed #263842
check-commit-log

00:00:38

 
  Build
passed #263843
build-mutter

00:01:27

 
  Test
passed #263844
test-mutter

00:03:19