Refactor VersionManager detection logic #3894
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Motivation
Looking at #3878 I noticed that adding a new version manager was requiring a lot of duplication of logic. While working on removing that I also noticed that even the existing manager were duplicating logic, so I took the opportunity to refactor all the managers.
Implementation
I moved the logic to detect the version manager to their classes. I also used a hash lookup instead of the exisint
switchstatement full of duplicated logic.