Worker pools can be configured to run in non-HA mode and allow to upgrade to HA mode

[tobiscr]

Description

Worker pools have to support an option to run in non-HA mode (1 zone = 1 worker node). But we allow customers to upgrade them to HA (3 zones = 3 nodes).

KEB is responsible to set the amount of zone in the RuntimeCR. KIM will consider changes of the zones of a worker pool and upgrade GArdener's shoot-spec accordingly.

AC:

• KEB provides list of zones per worker and KIM will update the zones in Shoot-Spec accordingly
• We allow only to upgrade from non-HA to HA. Downgrade to non-HA is not supported (technically also not possible in Gardener)

Reasons

Support HA/non-HA mode for worker pools

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