OCM-7317 | feat: add support for registry config

[andreadecorte]

What this PR does / why we need it: This PR adds support to configure the registries in HCP clusters.

The new feature is optional.

The input format is aligned with the one exposed by the APIs (which is coming from OCP API themselves, to facilitate user adoption).

Validation in the provider is kept to a minimum initially, as it is done on backend side.

Code is covered by unit testing and subsystem tests.

There is an additional Make target to generate code coverage from unit tests.

Example of input:

resource "rhcs_cluster_rosa_hcp" "rosa_hcp_cluster" {
  ...

  registry_config = {
    registry_sources = {
      allowed_registries = null
      blocked_registries = ["blocked.io", "blocked2.io"]
      insecure_registries = null
    }
    allowed_registries_for_import = [
    {
      domain_name = "registry.io"
      insecure = false
    }
    ]
  }
}

Which issue(s) this PR fixes (optional, use fixes #<issue_number>(, fixes #<issue_number>, ...) format, where issue_number might be a GitHub issue, or a Jira story (OCM-xxxx): Fixes OCM-7317

Change type

• [X] New feature
• [ ] Bug fix
• [ ] Build
• [ ] CI
• [ ] Documentation
• [ ] Performance
• [ ] Refactor
• [ ] Style
• [ ] Unit tests
• [ ] Subsystem tests

Checklist

• [X] Subject and description added to both, commit and PR.
• [X] Relevant issues have been referenced.

[chenz4027]

/lgtm

[openshift-ci[bot]]

@chenz4027: changing LGTM is restricted to collaborators

In response to [this](https://github.com/terraform-redhat/terraform-provider-rhcs/pull/790#issuecomment-2354034656): >/lgtm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[gdbranco]

/approve /lgtm

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gdbranco

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/terraform-redhat/terraform-provider-rhcs/blob/main/OWNERS)~~ [gdbranco] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[andreadecorte]

/retest

[andreadecorte]

/test rosa-sts-private-critical-high-presubmit

[andreadecorte]

/test rosa-sts-private-critical-high-presubmit

[openshift-ci[bot]]

@andreadecorte: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/rosa-sts-private-critical-high-presubmit	c1ef9584208129ae900a5da1034d7ccc36d5baa3	link	true	/test rosa-sts-private-critical-high-presubmit

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository. I understand the commands that are listed [here](https://go.k8s.io/bot-commands).

[gdbranco]

Merging considering the error is flaky related to dependency violation during teardown