Create 2025-10-01-new-file-type-support.mdx

[warnessa]

New file type support

Summary

added new file type support changelog for DLP and gateway

Documentation checklist

• [ x] Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• [x ] The documentation style guide has been adhered to.

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