Upgrade filescan-end-to-end app to version 4/8 of the template

[SandGrainOne]

Description

Description

We should consider updating the filescan-end-to-end to the latest versions of the app template. Apps can now be on dotnet 8 with version 8 of the backend and use the latest front-end changes by using version 4 of the frontend.

Additional Information

We need to perform the same with the storage-end-to-end app as well. https://github.com/Altinn/altinn-storage/issues/366

Tasks

• [x] Run the upgrade tool to get most changes automatically added
• [x] Build and test the changes
• [x] Update the docker file if not already done by the tool

Acceptance Criteria

• [x] The new version of filescan-end-to-end works without functional changes

[acn-sbuad]

Use case tests running ok in all envs