chore(nextjs): add unit test coverage for untested code paths in @asgardeo/nextjs SDK

[DimalshaMadushani]

Purpose

Add unit tests for the first set of files in the server/actions folder of @asgardeo/nextjs.

Also noted that in getBrandingPreference.ts, the variable sessionId is defined but not used — this might be an implementation oversight.

Next steps:
I plan to continue adding test coverage for the remaining files in the @asgardeo/nextjs SDK to complete the coverage improvement initiative.

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Related Issues

• chore: add unit test coverage for untested code paths in @asgardeo/nextjs SDK #168

Related PRs

• N/A

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Checklist

• Followed the CONTRIBUTING guidelines.
• Manual test round performed and verified.
• Documentation provided. (Add links if there are any)
• Unit tests provided. (Add links if there are any)

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines?
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets?

[asgardeo-github-bot]

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