ROX-29909: Configure and document Dev ROSA classic cluster provisioning

[kovayur]

Description

The OSD doc is now obsolete, replaced by the ROSA cluster provisioning doc. All relevant information regarding fleet deployment, tenant creation, and attaching the secured cluster has been updated.

Checklist (Definition of Done)

• Unit and integration tests added
• Added test description under Test manual
• Documentation added if necessary (i.e. changes to dev setup, test execution, ...)
• CI and all relevant tests are passing
• Add the ticket number to the PR title if available, i.e. ROX-12345: ...
• Discussed security and business related topics privately. Will move any security and business related topics that arise to private communication channel.
• Add secret to app-interface Vault or Secrets Manager if necessary
• RDS changes were e2e tested manually
• Check AWS limits are reasonable for changes provisioning new resources

Test manual

TODO: Add manual testing efforts

# To run tests locally run:
make db/teardown db/setup db/migrate
make ocm/setup
make verify lint binary test test/integration

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johannes94, kovayur, kurlov

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• OWNERS [johannes94,kovayur,kurlov]

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[johannes94]

Note: I didn't test the documentation, but it looks good to me. Since it's only documentation I would just adjust it on the fly the next time I'm needing a dev cluster, which is why I approved.