SCC module is missing s2s auth policy for event notifications

[ocofaigh]

The auth policy doesn't seem to be needed to configure the event notifications integration, however I suspect without it, events won't flow to the instance.

The policy would look something like this:

resource "ibm_iam_authorization_policy" "en_policy" {
  source_service_name         = "compliance"
  source_resource_group_id    = var.resource_group_id
  target_service_name         = "event-notifications"
  target_resource_instance_id = local.en_guid
  roles                       = ["Event Source Manager"]
}

As always we should provide a skip boolean variable to optionally skip creation of the auth policy. And there should be a count around auth policy so it only occurs if:

• not using existing SCC instance
• not setting the skip boolean to true
• user is passing an event notifications instance to configure the integration\

Ensure this gets exposed in the DA too

[kierramarie]

PR failing because of provider issue: IBM-Cloud/terraform-provider-ibm#5890