npm_and_yarn in /showcase/angular-lts-showcase for @angular/common, @angular/compiler, @angular/core, @angular/forms, @angular/platform-browser-dynamic, @angular/router, @angular/compiler-cli - Update #875966927

npm_and_yarn in /showcase/angular-lts-showcase for @angular/common, @angular/compiler, @angular/core, @angular/forms, @angular/platform-browser-dynamic, @angular/router, @angular/compiler-cli - Update #875966927 #531