Q&A Agent - Allow powerpoint files to be uploaded into knowledge bases

Enhance the knowledge base by enabling users to upload PowerPoint (.pptx) files directly. This will allow teams to store, organize, and reference presentations within the knowledge base, ensuring that important information shared in slide decks is easily accessible. By supporting PowerPoint file ingestion, users can search and query content from these files alongside other documents, improving knowledge discovery and supporting use cases that rely on presentation materials.