CSS: Add missing jQuery.cssNumber entries

[mgol]

Summary

This covers aspect-ratio, scale, and a few others.

A few properties have been taken from React:
https://github.com/facebook/react/blob/afea1d0c536e0336735b0ea5c74f635527b65785/packages/react-dom-bindings/src/shared/CSSProperty.js#L8-L58

Fixes gh-5179

The summary of my changes:

1. Removed quotes
2. Copied the list from React
3. Removed non-standard (?) APIs:
   1. flexNegative
   2. flexOrder
   3. flexPositive
   4. gridColumnSpan
   5. gridRowSpan
4. Removed the old flex API:
   1. boxFlex
   2. boxFlexGroup
5. Removed because they accept px as well (so adding them would be a breaking change):
   1. borderImageOutset
   2. borderImageWidth
   3. columns
   4. flex
   5. tabSize
   6. strokeDasharray
   7. strokeDashoffset
   8. strokeWidth
6. Removed because only prefixed available & non-prefixed version - if available - unstable:
   1. boxOrdinalGroup
   2. lineClamp

Also, unquote keys in jQuery.cssNumber - this was done in the first commit for easier review.

+53 bytes

Checklist

• New tests have been added to show the fix or feature works
• Grunt build and unit tests pass locally with these changes
• If needed, a docs issue/PR was created at https://github.com/jquery/api.jquery.com
• jQuery Migrate needs to be updated with the new list when this lands

[timmywil]

LGTM