WIP: Support ROSA GovCloud HCP clusters

[ironcladlou]

🚧 WIP 🚧

Before this commit, the modules made two assumptions which prevented creation of HCP clusters on ROSA GovCloud:

1. ARN formats hard-coded the AWS partition
2. The rhcs_cluster_rosa_hcp module always set a billing account ID, which should always be empty for GovCloud HCP clusters.

This commit makes ARN partition segments dynamic with regards to the current AWS account, and sets a null billing account ID when targeting GovCloud. The result is HCP clusters can be successfully created on ROSA GovCloud.

TODO: This depends on a new provider version which includes:

• OCM-17531 | feat: Enable refresh token support in OCM API auth flow terraform-provider-rhcs#946
• OCM-17691 | fix: Make billing account ID optional to enable GovCloud HCP cluster creation terraform-provider-rhcs#947

[openshift-ci]

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[openshift-ci]

Hi @ironcladlou. Thanks for your PR.

I'm waiting for a terraform-redhat member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[openshift-merge-robot]

PR needs rebase.

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