chore(ci-doc): documentation for RHDH setup in ephemeral env using OCP.

[subhashkhileri]

Description

Documentation for RHDH setup in ephemeral env using OCP.

Which issue(s) does this PR fix

https://issues.redhat.com/browse/RHIDP-4764

PR acceptance criteria

Please make sure that the following steps are complete:

• GitHub Actions are completed and successful
• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
• Add a screenshot if the change is UX/UI related

How to test changes / Special notes to the reviewer

[github-actions]

The image is available at:

• quay.io/janus-idp/backstage-showcase:pr-2141 or
• quay.io/janus-idp/backstage-showcase:pr-2141-129c8cfb

[nilgaar]

/approve

[nilgaar]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nilgaar

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[github-actions]

The image is available at:

• quay.io/janus-idp/backstage-showcase:pr-2141 or
• quay.io/janus-idp/backstage-showcase:pr-2141-f5808d41