Remove transformation traits from behats and implement contexts instead

[zuk3975]

Questions	Answers
Branch?	develop
Description?	Using traits as transformations in behat contexts isn't right because once you use the trait in one context it will be shared across whole Feature. That means all the other contexts will be unstable, as you are not aware if the trait is used in one or another context. So this PR provides simple yet a bit cleaner solution - instead of traits, implement Contexts with related transformations, so once we need a transformer, we add that transformer context to the feature in behat.yml and then its easier to spot when feature is dependant on transformer or not. (open to improvements, but this one was first and only idea how to reuse transformers for now)
Type?	refacto
Category?	TE
BC breaks?	no
Deprecations?	no
Fixed ticket?
How to test?	travis ✔️

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[zuk3975]

rr travis 😭