[#83716736] Update mms backup & monitoring agents

- Change package install procedure
- Add more tests
- Add cibuild script shenanigans
@mkantor Yeah. Based it on what we do for the chef-kitchen stuff. I will look into your link though. I tried setting: `set +o errexit / set -o errexit` when dealing with rvm once but it did not seem to fix the issue and ultimately I had to get rid of the -o flag... :-/