Add a direct link to the commit source in the build page

When I'm looking at a build report, I often want to see the detail of the commit that prompt the build. That's why I changed the template.

I tried to write a generic code but I have not tested it with BitBucket or GitLab.

I hesitated to place this link into the "alert" section, on the top of the page, but the phrase "commit 43e444 to master branch" is used elsewhere with internal links. One rule for a good user experience is to have a consistent interface.