Create helper function to find release info for a project (follow-up issue to locale collect project information)

This issue might need a better title.

Here is the code that spurred it:

        // Find a suitable release to use as alternative translation.
        foreach ($project_updates[$name]['releases'] as $project_release) {
          // The first release with the same major release number which is not a
          // dev release is the one. Releases are sorted the most recent first.
          if ($project_release['version_major'] == $matches[1] &&
              (!isset($project_release['version_extra']) || $project_release['version_extra'] != 'dev')) {
            $release = $project_release;
            break;
          }
        }