Add multiple update selectors

[wilwell]

This PR introduces the functionality of multiple update selectors.

Instead of outdated UpdateSelector users can use UpdatePlan with list of ComponentUpdateSelector inside it.
Each ComponentUpdateSelector can either contain ComponentClass or Component.

ComponentClass contains Everything, Nothing, Stateless groups of component. If operator sees Nothing component class, then all updates are forbidden.
Component could has Type and Name fields. If Name is not set then all components with this Type will be updated.

Also I've added webhook check, that empty UpdatePlan is forbidden. In case if UpdatePlan is not set operator uses values of deprecated UpdateSelector for smoother transition between versions.

[l0kix2]

Please rebase on the main branch since #387 is merged — which have couple of new stages in the flows

[wilwell]

I've added e2e test. Please review it. We have two unanswered questions

1. Do we wnat to rename Group to Class?
2. Is it ok to use Name in a such way? Or want shorter variant. In this case we need to agree waht to do with default empty names.