process each GIT_REPO_UPDATE events independently

This task is part of story #7540 have all Git events consumed all at once

Change-Id: I4699584c05b5f054923895efe69f6cb502ec496b
Merge commit 'refs/changes/88/3288/1' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  process each GIT_REPO_UPDATE events independently

Change-Id: I39d74d0170ecf18e4e188cf7fd06fb99eb0976bf
This is Tuleap 7.7.99.40

Change-Id: I6c43841c0ede696e7d1f08831573e19c8c78ad3a