improve validation: ensure consistent observedBy in ObservationConstraint

[Rdataflow]

• pass contributor as argument
• make cube:observedBy to be consistent in the ObservationConstraint
• add test
• drop injection

[changeset-bot]

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[Rdataflow]

@tpluscode would you mind starting the CI test ?

[Rdataflow]

@tpluscode it seems the current workflow injects/overrides the observer but only in the observations...

How would it be possible to set the observer globally (observations, shape)?
would it i.e. make more sense to pass the observer argument in the transform step already (instead of injection) WDYT?

feel free to build upon theese crafted commits... it's at your disposition 👍