WHY are these changes introduced?

Fixes #1420

The current implementation of validateAuthenticatedSession does not handle CORS preflight OPTIONS requests properly. These requests are being blocked by the authentication middleware, causing issues with cross-origin resource sharing.

WHAT is this pull request doing?

This pull request introduces handling for preflight OPTIONS requests in the validateAuthenticatedSession middleware. The change ensures that preflight requests bypass authentication checks and respond with the appropriate CORS headers, fixing the issue of blocked preflight requests.

Additionally, TypeScript documentation (TSDoc) has been added to the middleware and related functions to provide clarity on their purpose and functionality.

Changes include:

• Added a check for OPTIONS requests within the middleware.
• Responded with the necessary CORS headers and a 200 OK status for preflight requests.
• Added TSDoc to improve code readability and maintainability.

Type of change

• Patch: Bug (non-breaking change which fixes an issue)
• Minor: New feature (non-breaking change which adds functionality)
• Major: Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have used pnpm changeset to create a draft changelog entry (do NOT update the CHANGELOG.md files manually)
• I have added/updated tests for this change
• I have documented new APIs/updated the documentation for modified APIs (for public APIs)