fix: Authentication Not Enforced, Resulting in Identity Provider Errors

[UtkarshMishra-Microsoft]

Purpose

• ...
  This pull request improves error handling and data validation in the getUserInfo function in src/frontend/src/api/api.ts. The changes ensure that user info is parsed more robustly and that errors during the fetch process are handled gracefully.

Error handling and data validation improvements:

• Wrapped the fetch call in a try-catch block to handle network or parsing errors, logging any issues and returning an empty array if an error occurs.
• Added logic to validate the payload and construct a normalized UserInfo object, ensuring required fields are present and fallback values are used if necessary.

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

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