Merge branch 'BB-680-K3d-Fresh-Install-And-Upgrade' into 'master'

Bb 680 k3d fresh install and upgrade

**What:**
* Adds a new job that tests new changes on a given branch as an upgrade from master not just a fresh install
* Cleans up some of the .gitlab-ci code

**Why:**
* End customers will most likely not be doing a fresh install of the cluster everytime a new package is released, this starts to try and test that upgrade.

**Jira Ticket:** https://jira.il2.dsop.io/browse/BB-680

See merge request platform-one/big-bang/umbrella!32