Test for files ending with blank lines

This test is implemented using sed. The list of files is echoed to the output,
and the test is a (warning-class) failure if the list is non-empty. Files can
be explicitly omitted from this test by adding them to `WHITESPACE_WHITELIST`
in `.gitlab-ci.yml`.
1 job for endblanks in 4 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Generate
passed #39176
cross
generate

00:00:04