build: install snapshot builds for angular-devkit and schematics (#24458)
build: install snapshot builds for angular-devkit and schematics (#24458)

* build: install snapshot builds for angular-devkit and schematics

Our snapshot build jobs should also install the snapshots for the devkit
and schematics packages (owned by the tooling team). These need to match
up with the CLI package that is currently already updated by the snapshot
setup script.

* fixup! build: install snapshot builds for angular-devkit and schematics

Make code a little more readable
angular/components,angular/components,angular/components,crisbeto/material2,angular/components,crisbeto/material2,crisbeto/material2,crisbeto/material2