build: add commit message scope for multiple components (#22402)
build: add commit message scope for multiple components (#22402)

As discussed, adds a new `multiple` scope for commits that cover more than one area.
DevVersion/material2,angular/components,mmalerba/material2,crisbeto/material2,angular/components,mmalerba/material2,josephperrott/material2,mmalerba/material2,DevVersion/material2,mmalerba/material2,DevVersion/material2,angular/components,mmalerba/material2,crisbeto/material2,crisbeto/material2,angular/components,josephperrott/material2,DevVersion/material2,josephperrott/material2,crisbeto/material2,josephperrott/material2,josephperrott/material2,DevVersion/material2