BE: Edit page groups

[mlqn]

Description

Edit page groups

Discuss with apps if we can use ids on page groups? This would simplify our api.

Why

As a user, I want to edit page groups to control how they behave and appear in the navigation — for example, to visually indicate whether a group is completed by showing a check mark. This helps users keep track of their progress and improves the overall navigation experience.

Config

Altinn/app-frontend-react#2831

Additional Information

No response