WIP feat: migration script for dynamic plugins to oci artifacts

[Fortune-Ndlovu]

Description

A migration script to help customers transition from bundled plugin wrappers to OCI artifacts. By auto-detecting RHDH installations in OpenShift/Kubernetes clusters, then extracting the catalog index from quay.io/rhdh/plugin-catalog-index:1.8, and also extracting the bundled plugins in the RHDH container, and then mapping the plugins to their OCI equivalents with specific versions. Lastly, generating a user-friendly migration plan in the logs so the user can do the migration themselves.

Which issue(s) does this PR fix or relate to

• Fixes https://issues.redhat.com/browse/RHIDP-7370

PR acceptance criteria

• Tests
• Documentation

How to test changes / Special notes to the reviewer

You need an OCP cluster up and have an rhdh/backstage application created.
./migrate-dynamic-plugins-to-oci.sh

[openshift-ci]

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[Fortune-Ndlovu]

closing issue, because Resolution: Won't Fix - Scope Changed

After team discussion and analysis, we've decided to close this issue and focus on documentation instead.

Decision rationale:

Migration is simple enough for users to do manually with clear documentation
Complex script adds unnecessary complexity and potential failure modes
Better user experience with documentation/simple sed examples
Build process isn't stable yet (circular dependency issues)
OCI artifacts aren't fully GA yet