* AuthN: Save external services RBAC roles
* Add missing test
* Placing roles in the same group
* Split function to gen role and assignment
* add test case and comments
* Ensure we check external service roles are assigned once only
* Update pkg/services/accesscontrol/models_test.go
Co-authored-by: Misi <mgyongyosi@users.noreply.github.com>
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Co-authored-by: Misi <mgyongyosi@users.noreply.github.com>