fix(collector): stop treating binary types with no converter as text

[moneebullah25]

Pull Request Type

• ✨ feat (New feature)
• 🐛 fix (Bug fix)
• ♻️ refactor (Code refactoring without changing behavior)
• 💄 style (UI style changes)
• 🔨 chore (Build, CI, maintenance)
• 📝 docs (Documentation updates)

Relevant Issues

resolves #6667

Description

Files whose extension has no entry in SUPPORTED_FILETYPE_CONVERTERS go through isTextType(). isKnownTextMime() only rejects MIMEs listed in badMimes or whose top-level type is in nonTextTypes, so .gif, .bmp, .tiff/.tif, .heic, .doc, .xls, .ppt, .rar and .7z were classified as text and ingested through the .txt converter as garbage.

This adds their MIME types (plus image/heif, the sibling of image/heic) to badMimes, so they are rejected with the existing "not supported for parsing and cannot be assumed as text file type" message, like .exe or .zip. Types that have a converter (png, jpg, webp, etc.) are unaffected because the converter lookup happens before isTextType() is called. No image support is added.

Additional Information

Other binary MIMEs not covered by the issue (e.g. gzip/tar archives) still pass through the MIME check; left out to keep this change scoped to the reported types.

Developer Validations

• I ran yarn lint from the root of the repo & committed changes
• Relevant documentation has been updated (if applicable)
• I have tested my code functionality
• Docker build succeeds locally

[shatfield4]

LGTM