refs https://github.com/TryGhost/Toolbox/issues/309
- this column is not used and I was going to add `validation` to it but
it's better to clean it up and re-add the column if we need it again
refs: https://github.com/TryGhost/Toolbox/issues/229
- We're getting rid of the concept of api versions inside of Ghost
- Instead of storing the supposed api version a webhook was created with, store the current ghost version
- This way we can determine if anything signicant changes in future and we need to update webhooks or something
- webhooks are one of the remaining places where we need some sort of api version handling
- in order to fixup the tests for this, I wanted to first change them to use the e2e framework