chore: improve runtime configuration

[martinothamar]

Description

Backport of #1661

Related Issue(s)

• N/A

Verification

• 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)
• All tests run green

Documentation

• User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

[coderabbitai]

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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 chore/v8.7-runtime-config-imp

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[sonarqubecloud]

Quality Gate failed

Failed conditions
18.0% Coverage on New Code (required ≥ 65%)
8.3% Condition Coverage on New Code (required ≥ 65%)

See analysis details on SonarQube Cloud