build: only stamp build builds in release mode (#14431)
build: only stamp build builds in release mode (#14431)

* No longer runs the `workspace_status_command` for normal Bazel builds. This should speed up builds by about ~8 seconds init phase.
jelbourn/material2,crisbeto/material2,andrewseguin/material2,DevVersion/material2,Jefiozie/material2,DevVersion/material2,mmalerba/material2,crisbeto/material2,Jefiozie/material2,mmalerba/material2,Jefiozie/material2,crisbeto/material2,josephperrott/material2,mmalerba/material2,josephperrott/material2,Jefiozie/material2,andrewseguin/material2,angular/components,angular/components,Jefiozie/material2,mmalerba/material2,jelbourn/material2,DevVersion/material2,jelbourn/material2,josephperrott/material2,crisbeto/material2,josephperrott/material2,josephperrott/material2,DevVersion/material2,andrewseguin/material2,DevVersion/material2,jelbourn/material2,andrewseguin/material2,angular/components,mmalerba/material2,angular/components,jelbourn/material2,andrewseguin/material2