Migrate from Provisioner to KIM on DEV

[Disper]

Acceptance Criteria

• Old clusters are now also managed by KIM (we have ran the migration script)
• Migration should be resilient to possible simultaneous upgrades done by the user (e.g. if user changes machine type).
• At any given time, it's possible to create new shoots
• At any given time, it's possible to upgrade new shoots
• when CR is created for a cluster created by the old Provisioner, KIM should not attempt to create a cluster
  Possibly could be achieved by having additional CR's annotation such as (operator.kyma-project.io/do-not-provision that would need to be respected by KIM
• Remove https://github.com/kyma-project/control-plane/tree/main/components/schema-migrator
• Assure that the scenario for a cluster created via provisioner and migrated to KIM works (also from KEB perspective)
• Provisioner is disabled on DEV