[LSP-1319]: add wrapResponse utility and update handlers to use it and fix CORS issue

[michael-puzon-resultscx]

##Background:
A reusable utility was needed to standardize API responses and error handling. Additionally, there were CORS issues affecting cross-origin requests, requiring a consistent solution for all endpoints.

##Changes:

• Added a new wrapResponse utility in src/lib to wrap handler responses and errors.
• Refactored handlers (e.g., osAutoSuggestHandler) to use the new wrapResponse utility.
• Ensured all responses include proper CORS headers (Access-Control-Allow-Origin and Access-Control-Allow-Credentials) to resolve cross-origin issues.
• Improved error logging and handling for better debugging and reliability.

[Copilot]

Pull request overview

This PR introduces a shared wrapResponse helper intended to standardize Lambda handler responses/errors and apply consistent CORS headers, and refactors the OpenSearch search + autosuggest handlers to use it.

Changes:

• Added src/lib/wrap-response.js utility to wrap handler execution and format responses.
• Refactored osSearchHandler to delegate response formatting/CORS to wrapResponse.
• Refactored osAutoSuggestHandler to delegate response formatting/CORS to wrapResponse.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 9 comments.

File	Description
src/lib/wrap-response.js	New response wrapper that sets statusCode/body and adds CORS headers for success/error paths.
src/handlers/osSearchHandler.js	Updated to use wrapResponse and return raw results instead of a proxy response object.
src/handlers/osAutoSuggestHandler.js	Updated to use wrapResponse and return { suggestions, total } instead of a proxy response object.

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