Add possibility to trigger a Shoot reconciliation by KIM

[tobiscr]

Description

We saw cases where a cluster reconciliation was required, but KIM is currently not supporting to trigger an reconciliation from outside.

We agreed to add this possibility by adding an annotation to a RuntimeCR. KIM has to consider this annotation and reconcile the cluster.

Expected behaviour has to be:

1. SRE / On-call engineer adds an annotation to the RuntimeCR (e.g. operator.kyma-project.io/force-shoot-reconciliation: true)
2. KIM reconciles the Shoot spec
3. KIM removes the annotation after reconciliation is completed

AC:

• KIM reacts on an annotation (e.g. operator.kyma-project.io/force-shoot-reconciliation: true) and reconciles a Shoot spec
• After the reconciliation is completed, KIM removes the annotation