Add partial support for AVIF in Edge Dev/Canary (#6756)

* Add conditional support for AVIF in Edge Dev/Canary

MicrosoftEdge/Status#723

* Fixing avif requirements

After setting all flags and requirements, avif doesn't seem to work on Windows 10.
So far it looks like Windows 11 Moment 3 might be the requirement. Needs further verification though

* Add conditional support in notes instead

* remove trailing colon

features-json/avif.json

@@ -559,7 +559,7 @@
  "3.0-3.1":"n"
  }
  },
- "notes":"",
+ "notes":"Supported in Edge 116 and newer only on Windows 11 (Moment 3 or Later)",
  "notes_by_num":{
  "1":"Can be enabled in Firefox via the `image.avif.enabled` pref in `about:config`.",
  "2":"Supports still images. Animated image sequences are not supported.",