Super-Admins via `extra-user-roles` Instead of `entity-permissions`

[MattiaSarti]

Context

Charmed MLflow 3 is being implemented and data-integrator is being relied on to configure user grants across workspaces, in the new multi-tenant setup. Changes are not on stable risk yet and backward-incompatible integration changes can still be carried out.

What needs to get done

Modify both data-integrator and MLflow to define super-admins via extra-user-roles instead of entity-permissions.

Definition of Done

Both data-integrator and MLflow are modified to define super-admins via extra-user-roles instead of entity-permissions.

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-9046.

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