Pass context.Context down

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this will make it possible to cancel requests for top and trace processes ...

Guide: https://golangbyexample.com/using-context-in-golang-complete-guide/
Ref: https://pkg.go.dev/context

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for gitlab3 see #358 it will be removed ...
for gitlab I did not pass it down since I would have to extend the custom client just to throw that change after #358 got merged

so if #358 lands first I'll add it here else it's the other way arround