Update git and install git-lfs QA docker image
This MR updates git from 2.11.0 to 2.19.1 (latest in stretch-backports) and also install git-lfs 2.5.2 as it's needed in new Geo QA tests.
What are the relevant issue numbers?
https://gitlab.com/gitlab-org/gitlab-ee/issues/7516
Does this MR meet the acceptance criteria?
-
Changelog entry added, if necessary [ ] Documentation created/updated-
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides [ ] Conforms to the database guides
Edited by Ash McKenzie