Reference the commit in which job was discovered

[h1alexbel]

For now we return just the name of the repo, created, updated and deleted files.

However for referencing the commit sha, where the job was discovered we should return not the plain list of file names, but a Map with a sha as a key and created, updated, deleted.

I believe we need to make a transition from this code:

List<String> created();

to this one:

Map<String, List<String>> created();