Add kms boot volume encryption on default and additional worker pools

[vburckhardt]

Description

Feature landed in terraform provider >= 1.42 .

• Default worker pool: https://registry.terraform.io/providers/IBM-Cloud/ibm/1.51.0/docs/resources/container_vpc_cluster#example-with-boot-volume-encryption
• Other worker pools: https://registry.terraform.io/providers/IBM-Cloud/ibm/1.51.0/docs/resources/container_vpc_worker_pool#kms_instance_id

This comes in addition to existing support for encrypting secrets/etcd at https://github.com/terraform-ibm-modules/terraform-ibm-base-ocp-vpc/blob/main/main.tf#L92

New or affected modules

• terraform-ibm-base-ocp-vpc

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[Soaib024]

PR merged - hence closing