Use contextual tuples to give access to admins for managinc roles/groups

[nsklikas]

With the introduction of contextual tuples on #339, we can avoid adding tuples for all roles/groups that are created to give admin permissions (https://github.com/canonical/identity-platform-admin-ui/blob/main/pkg/roles/service.go#L133). Instead we can add this as a contextual tuple to the check whenever someone tries to edit a role or group.

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/IAM-939.

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