Import Controller support for registering ROSA & ROSA-HCP into an ACM Hub

Value Statement

Allows us to easily add ROSA into ACM.

Definition of Done for Engineering Story Owner (Checklist)

• When a ManagedCluster is created, and the appropriate OCM token and ROSA cluster name is provided, it is imported into ACM
• Documented if Tech Preview
• QE and build tests

Development Complete

• The code is complete.
• Functionality is working.
• Any required downstream Docker file changes are made.

Tests Automated

• [x] Unit/function tests have been automated and incorporated into the
  build.
• [x] 100% automated unit/function test coverage for new or changed APIs.

Secure Design

• [x] Security has been assessed and incorporated into your threat model.

Multidisciplinary Teams Readiness

• [NA] Create an informative documentation issue using the [Customer
  Portal_doc_issue template](
  https://github.com/stolostron/backlog/issues/new?assignees=&labels=squad%3Adoc&template=doc_issue.md&title=),
  and ensure doc acceptance criteria is met. Link the development issue to
  the doc issue.
• [NA] Provide input to the QE team, and ensure QE acceptance criteria
  (established between story owner and QE focal) are met.

Support Readiness

• [NA] The must-gather script has been updated.