feat: checks for `$grid-breakpoints` map list (#30609)
feat: checks for `$grid-breakpoints` map list (#30609)

Co-authored-by: Martijn Cuppens <eb1e95cd7406bd48b9f875e0ae2b2d93fd22c202@gmail.com>
twbs/bootstrap,tjkohli/bootstrap,coliff/bootstrap,zalog/bootstrap,tjkohli/bootstrap,inway/bootstrap,GerHobbelt/bootstrap,GerHobbelt/bootstrap,inway/bootstrap,m5o/bootstrap,GerHobbelt/bootstrap,coliff/bootstrap,zalog/bootstrap,m5o/bootstrap,zalog/bootstrap,inway/bootstrap,twbs/bootstrap