feat(@angular/ssr): add `getHeaders` method to `AngularAppEngine` and `AngularNodeAppEngine` for handling pages static headers#28338

alan-agius4 merged 3 commits intoangular:mainangular/angular-cli:mainfrom

alan-agius4:create-node-appalan-agius4/angular-cli:create-node-appCopy head branch name to clipboard