⬆️ feat: Cancel chat file uploads; fix: Assistant uploads

[danny-avila]

Summary

This PR mainly implements ability to cancel file upload requests and closes #4295

Previously, file upload requests could hang indefinitely without allowing any other chat operation until refresh or the upload errored/completed. Now you can "cancel" file upload requests; however, cancelling the upload process server-side proved to be non-trivial. As a result, a message is issued explaining the fact that the upload may still go through, and will need to be manually deleted as desired.

To truly cancel the upload server-side, some message queue system to abort/programmatically cancel the file upload via another endpoint, as express.js will not recognize the request was cancelled via req.on('close')

• Consolidated file upload logic and rendering into a single parent component called FileFormWrapper, refactoring the AttachFile component to better handle file uploads and UI rendering.
• Moved file-related mutations to a dedicated file for better organization and improved typing.
• Improved typing for file-related functions and components.
• Refactored the useFileHandling hook to include an abortUpload function and better handle file upload states.
• Updated the ChatForm component to use the new FileFormWrapper and simplified its structure.

Other Changes

• Added Azure OpenAI to the paramEndpoints set for better endpoint handling.
• Added localization for file upload errors, excluding variable strings.

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have commented in any complex areas of my code
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have written tests demonstrating that my changes are effective or that my feature works
• Local unit tests pass with my changes
• Any changes dependent on mine have been merged and published in downstream modules