Remove operatorkit dependency from silence-operator

[JosephSalisbury]

fyi @Rotfuks / @QuentinBisson, tl;dr - we want to get rid of operatorkit, silence-operator still uses it

probably the most straightforward plan here would be to move to flux for the silence syncing, and then rewrite the remaining behaviour in a new kubebuilder operator, but happy to discuss

i'd like to get this done, but there's no real urgency on it, it's more on the technical debt side

[QuentinBisson]

I agree on your plan but I'm pretty sure this will not be prioritized before 6-9 months and we work on our silence epic

[Rotfuks]

Are you happy with "next year" for this to be done, @JosephSalisbury ?

[JosephSalisbury]

works for me, as long as you have a plan for it <3