cascading-runs: make looking for the /git-artifacts comment more robust

In my tests, it seems that the trailing newline may be shown when
searching without any token, and trimmed when searching with token.

That makes no sense, but let's guard against this condition anyway.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

GitForWindowsHelper/issues.js

@@ -29,7 +29,7 @@ const getGitArtifactsCommentID = async (context, token, owner, repo, headSHA) =>
     })
     const items = answer.items.filter(item =>
         item.text_matches.length === 1
-        && item.text_matches[0].fragment === '/git-artifacts\n\nThe tag-git workflow run was started\n'
+        && item.text_matches[0].fragment.trim() === '/git-artifacts\n\nThe tag-git workflow run was started'
     )
     return items.length === 1 && items[0].text_matches[0].object_url.replace(/^.*\/(\d+)$/, '$1')
 }