build: disable copying the minified umd bundles (#22522)
build: disable copying the minified umd bundles (#22522)

We used to copy the minified UMD bundles so that their size could be checked by the size bot. Since we haven't been running the bot for a long time, these changes remove the copying logic.
crisbeto/material2,mmalerba/material2,crisbeto/material2,angular/components,DevVersion/material2,crisbeto/material2,mmalerba/material2,angular/components,mmalerba/material2,josephperrott/material2,crisbeto/material2,DevVersion/material2,angular/components,DevVersion/material2,angular/components,josephperrott/material2,DevVersion/material2,josephperrott/material2,josephperrott/material2,mmalerba/material2,josephperrott/material2,mmalerba/material2,DevVersion/material2