Change Application c# model to app-lib ApplicationMetaData model in backend

[standeren]

Description

Since we are using the strict typed model from storage (Application) to (de)serialise applicationmetadata.json we are removing custom properties that app-frontend has introduced, such as logo i.e., when we do actions in Studio that demands updates of appmetadata. This involves operations like:

• Generating the data model since this operation might include changing class name references used in appmetadata
• Adding/changing/removing attachment components since this updates the data type in appmetadata

The issue of loosing the logo field has been reported by several service owners in slack:

• https://altinn.slack.com/archives/C03DX42K6AY/p1697098669123599
• https://altinn.slack.com/archives/C02ESDSC929/p1695292046457469

Solution

To avoid this from happening we need to use app-libs extended version of the appmetadata model since this allows all custom fields to be added to it. And when this model is passed to storage (which Studio does during deploy) Storage will ignore the additional properties which is okay since Storage does not need these.

[nkylstad]

Tested OK in dev.altinn.studio.
Added logo manually, and then made changes in the "config" modal to update applicationMetadata.
Logo was still in applicationMetadata file after changes.