[ENH] - Update upgrade prompt regarding shared group mounting

[viniciusdc]

Context

After merging PR #2593, any user groups besides admin, analyst, and develop have been unmounted from users' JupyterLab pods. While no data has been removed, this change breaks compatibility with existing deployments that rely on these custom groups.

• Include a prompt during the upgrade process to inform users about this change and guide them on how to manage their custom groups.
• Add detailed release notes about this change, allowing users to opt into the new role addition for existing groups.

Value and/or benefit

• backwards compatibility

Anything else?

No response

[viniciusdc]

The prompt will then ask the admin user running the upgrade if they want to include the missing role (bellow) to all existing groups to avoid the "removal" during the re-deployment. A message saying that it this is not an actual removal of data and can be rollebacked anytime from within the keycloak console should also be presented to provide context.

allow-group-directory-creation-role:
   component: shared-directory
   scopes: write:shared