Review CSS property value data with ranges

[foolip]

There's CSS data with these ranges for CSS property values based on https://github.com/openwebdocs/mdn-bcd-collector where data going back to the original support of the property wasn't available.

We can't use this data in web-features, and https://github.com/mdn/browser-compat-data/pull/22928 sorted out one such case where we had tagged the BCD features without realizing this. Similar ranges remain in many files in css/properties/.

A "burndown list" can be formed from these commands inside css/properties:

git grep -lF '"≤13.1"' # Safari, 193 matches
git grep -lF '"≤80"' # Chrome, 168 matches
git grep -lF '"≤11"' # IE, 131 matches
git grep -lF '"≤72"' # Firefox, 130 matches
git grep -lF '"≤83"' # Chrome, 28 matches

There are also Edge ≤79 ranges, but those are much fewer and probably not of the same origin.

cc @Elchi3 @queengooborg