feat: copy data values, presentation texts and due date when copying an instance - #1872

• Closes ICopyInstanceValidator: behov for å få kopiert over datavalues fra orginal til kopi instans altinn-studio#20862.
• Docs in docs: document copying of due date, data values and presentation texts altinn-studio-docs#3147

When an instance is copied today, dataValues, presentationTexts and dueBefore are not carried over from the source instance. Apps that set data values from code (for example an appVersion value that an ICopyInstanceValidator checks) lose those values on the first copy, so a copy of a copy can no longer be validated.

This PR adds three settings to copyInstanceSettings in applicationmetadata.json:

Keys that do not exist on the source are ignored. If a key is also derived from dataFields/presentationFields, the value recalculated from the copied form data is used.

"copyInstanceSettings": {
    "enabled": true,
    "includeDueBefore": true,
    "includedDataValues": ["appVersion", "customerId"],
    "includedPresentationTexts": ["name"]
}

Implementation notes

• The settings were added to CopyInstanceSettings in feat: add settings for copying due date, data values and presentationtexts altinn-storage#1121 (backported to the v4 interface line). This PR updates Altinn.Platform.Storage.Interface from 4.7.1 to 4.7.2, which contains them, so no app specific model is needed.
• Both the legacy /legacy/instances/{partyId}/{guid}/copy endpoint and the simplified instances/create endpoint with sourceInstanceId honour the settings. In the simplified endpoint the source instance is now fetched before the instance template is built so dueBefore can be set on creation (Storage has no endpoint for updating it afterwards). The archived check therefore runs before the instantiation validator instead of after it.
• The selected data values and presentation texts are sent in the instance template to Storage when the instance is created, so no extra Storage calls are made. Storage accepts presentationTexts on creation since feat: accept presentationTexts when creating an instance altinn-storage#1129. Against a Storage without that change, the presentation texts are silently dropped while data values and due date still work. Localtest gets the same change in Altinn/altinn-studio (feat(localtest): accept presentationTexts when creating an instance) and Altinn/app-localtest.
• The OpenAPI snapshots gained the three new properties on the CopyInstanceSettings schema, coming from the package update. The public API of the app libraries is unchanged.

Follow-ups

• Docs: Altinn/altinn-studio-docs PR (linked below) documents the new settings for v8 and v9 and in the app metadata model reference.
• Altinn Studio: application-metadata.schema.v1.json in the monorepo should get the three new properties so Studio validates them. Left out of this PR since this repository is subtree-merged into the monorepo later.

Verification

• New unit tests in InstancesController_CopyInstanceTests cover the legacy copy endpoint: the instance template sent to Storage has the listed values and dueBefore, unlisted and missing keys are left out, nothing is copied when the settings are absent, and no separate UpdateDataValues/UpdatePresentationTexts calls are made.
• New end-to-end test CopyInstance_SimplifiedEndpoint_CopiesConfiguredValuesFromSource in InstancesController_PostNewInstanceTests creates a source instance with a due date and custom data values/presentation texts, archives it, copies it through instances/create and asserts the copied instance's dueBefore, dataValues and presentationTexts.
• New AppMetadataTest verifies that applicationmetadata.json with the new settings deserializes as expected.
• Altinn.App.Core.Tests and Altinn.App.Api.Tests run on net10.0 (only runtime available locally): all tests pass except two pre-existing file-watcher tests (*ReloadsWhenKubernetesDataSymlinkChanges) that time out in this sandbox and are unrelated to this change. net8.0 was not run locally.
• dotnet csharpier check passes.

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