[Base OCP] See if we can stop using the `ibm_iam_account_settings` data lookup to determine account ID

[ocofaigh]

We are using the ibm_iam_account_settings data lookup here to fetch the account ID which we then pass to the reset_api_key null_resource block.

You need to be an account admin to run this data lookup. If you are not, you get this error:

│ Error: You are not authorized to use this API.
│ 
│   with module.ocp_base.data.ibm_iam_account_settings.iam_account_settings,
│   on .terraform/modules/ocp_base/main.tf line 283, in data "ibm_iam_account_settings" "iam_account_settings":
│  283: data "ibm_iam_account_settings" "iam_account_settings" {

Is there another way to determine the account ID? Perhaps directly in reset_iks_api_key.sh?