test: Split each test target and source entry into its own line
test: Split each test target and source entry into its own line

This makes it easier to lookup files alphabetically, see what is there
and what is missing, see the actual changes in diffs, and to temporarily
enable or disable tests in downstreams.

Signed-off-by: Guillem Jover <6f269179bd29909dac5e2359bafef574d0759c09@hadrons.org>

axboe/liburing,axboe/liburing,axboe/liburing