Make WorkContext.env customize-able and propagate-able

[simahawk]

ATM the env of the WorkContext comes from the collection.
This is sub-optimal because you cannot customize it for specific cases (eg: by setting a ctx key before calling a method).

Proposal: self.env should be assigned on __init__ and got from kw args. Defaults to collection.env if not available.
It should be added to propagate-able args too.

[github-actions]

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[simahawk]

@guewen may I ask your feedback on this?

[guewen]

Hey, it was definitely something that bothered me at some point and wanted to improve.
I remember fiddling with it at some point but did not reach a working/mature solution.