Implement AuthenticationMethod support in IInstanceClient

[tina-ahm]

Description

Related Issue(s)

• Implement AuthenticationMethod support in IInstanceClient #1498

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 feature/1498-instance-client-authentication

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[sonarqubecloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 65%)
0.0% Condition Coverage on New Code (required ≥ 65%)

See analysis details on SonarQube Cloud