Backend data loading

[adamhaeger]

Description

This PR implements backend initialization of app data as desribed in this ADR:

Altinn/app-frontend-react#3734

See the ADR for architetcture changes and rationale.

It is part of the larger refactoring work by the Frontend Next Taskforce.

Related issues:

• Move most initial data loading to app-backend #16309
• App-frontend: Ny arktektur #16359

Verification

• Related issues are connected (if applicable)
• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch backend-data-loading

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To fix this problem, simply remove the unused state variable declaration: const [sentToMutation, setSentToMutation] = useReactState<IParty | undefined>(undefined); on line 72. This change removes both the getter and setter since they are not used anywhere in the provided code. No further action, refactoring, or import changes are required as this is a local unused variable, and other surrounding functionality is unaffected.

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To fix the problem, remove the unused variable dataFromMutation from the destructuring assignment of the object returned by the useMutation hook. Specifically, on line 75 in the PartySelection component, update the destructuring from:

const { mutateAsync, data: dataFromMutation, error: mutationError } = useMutation({...});

to:

const { mutateAsync, error: mutationError } = useMutation({...});

This change removes the unused element without affecting the functional behavior of the code, since dataFromMutation was never utilized.

The best way to fix this problem is to remove the unused state variable declaration. Specifically, in file src/App/frontend/src/features/instantiate/containers/PartySelection.tsx, delete the line (line 86) that initializes [userHasSelectedParty, setUserHasSelectedParty] using useReactState(false);. No other changes are needed because the variable is not used elsewhere in the provided code snippet. This ensures the code is cleaner and does not contain unnecessary state.

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The correct fix is to delete the unused variable declaration for currentTaskId in the ProcessWrapper function in src/App/frontend/src/components/wrappers/ProcessWrapper.tsx, specifically on line 88. This will make the code more readable and eliminate an unnecessary variable with no impact on existing functionality. No imports or other code sections are affected by this change.