Epic Goal

Improve the User Experience when importing *ks clusters that require additional steps to configure a pull secret

Why is this important?

*ks clusters have additional required steps to allow the cluster to pull images from the Red Hat registry
- When the pull secret is not defined, the cluster will fail to import due to failure to deploy the Klusterlet and add-ons

Display a warning message to the user on the Import cluster page when a pull secret is not configured.
- Make clear this is a warning message only for *ks cluster import
- The pull secret can be defined in two ways:
  - Globally via the MultiClusterHub CR (https://access.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.5/html/install/installing#advanced-config-hub )
    - Most users will not have RBAC permissions to the MCH, so the UI will have to use the Console ServiceAccount, and send a true/false to the front-end if it is configured. Do not forward the entire MCH object to the front-end.
  - Per ManagedClusterSet via ManagedClusterImageRegistry CR (https://access.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.5/html/clusters/managing-your-clusters#imp-clust-custom-image-override )
Display a similar warning message from (1) on the cluster list/details page when a cluster is sitting in Pending import state
1. If a user imported the cluster from the CLI, and didn't see the warning message from the UI; we may want to still provide this warning in the console if they go to it to look for any details or hints.

CI - MUST be running successfully with tests automated
Release Technical Enablement - Provide necessary release enablement details and documents.
All scenarios are complete

CI - CI is running, tests are automated and merged.
Release Enablement <link to Feature Enablement Presentation>
DEV - Upstream code and tests merged: <link to meaningful PR or GitHub Issue>
DEV - Upstream documentation merged: <link to meaningful PR or GitHub Issue>
DEV - Downstream build attached to advisory: <link to errata>
QE - Test plans in Polarion: <link or reference to Polarion>
QE - Automated tests merged: <link or reference to automated tests>
DOC - Downstream documentation merged: <link to meaningful PR>