Isolate localStorage data by using unique keys

[mlqn]

Description of the bug

We should ensure that data stored in localStorage are isolated from each other by including the userId, app, and/or org into the keys (e.g. {org}-{userId}-{app}-selectedFormLayoutSetName instead of selectedFormLayoutSetName)

Steps To Reproduce

https://github.com/Altinn/altinn-studio/assets/24462611/c956df99-fe0b-4cad-bd7d-2e0bb7b60a32

Additional Information

No response