Grid container, row, and column padding/margin should always match. I missed this in my reviews and testing, unless there's uh something else I missed.
- Replaces make-container mixin's padding-x param with gutter to match naming
- Changes value of container padding variable to match grid gutter width variable
- Uses local CSS variable for container padding
Fixes #31642 (closed)
/cc @MartijnCuppens directly since the original PR at #29146 changed this