File uploader mimetype validation bug fix for drag and drop

[rrahulrroy]

Fixes FileUploaderDropzone not honoring the acceptedMimeTypes prop during drag and drop operations.

Issue: When users dragged and dropped files onto the FileUploaderDropzone, the component would accept any file type regardless of the acceptedMimeTypes prop configuration. The MIME type validation was only working for files selected through the native file picker.

Root Cause: The drag and drop event handler (handleDrop) was missing MIME type validation logic that was present in the file input selection flow.
Fixes #4377

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