Remove certificate manager service support

[kavya498]

Terraform will perform the following actions:

  # ibm_certificate_manager_import.cert will be created
  + resource "ibm_certificate_manager_import" "cert" {
      + algorithm                       = (known after apply)
      + begins_on                       = (known after apply)
      + certificate_manager_instance_id = "ibm_resource_instance.cm.id"
      + data                            = {
          + "content"      = "tls_self_signed_cert.ca.cert_pem"
          + "intermediate" = ""
          + "priv_key"     = "tls_private_key.ca.private_key_pem"
        }
      + expires_on                      = (known after apply)
      + has_previous                    = (known after apply)
      + id                              = (known after apply)
      + imported                        = (known after apply)
      + issuer                          = (known after apply)
      + key_algorithm                   = (known after apply)
      + status                          = (known after apply)
    }

Plan: 1 to add, 0 to change, 0 to destroy.

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

ibm_certificate_manager_import.cert: Creating...

Error: Certificate Manager Service is not supported anymore.

  on main.tf line 31, in resource "ibm_certificate_manager_import" "cert":
  31: resource "ibm_certificate_manager_import" "cert" {