fix(core): require 'static' flag on queries in typings (#30639)

This commit makes the static flag on @ViewChild and @ContentChild required.

BREAKING CHANGE:

In Angular version 8, it's required that all @ViewChild and @ContentChild
queries have a 'static' flag specifying whether the query is 'static' or
'dynamic'. The compiler previously sorted queries automatically, but in
8.0 developers are required to explicitly specify which behavior is wanted.
This is a temporary requirement as part of a migration; see
https://angular.io/guide/static-query-migration for more details.

@ViewChildren and @ContentChildren queries are always dynamic, and so are
unaffected.

PR Close #30639

aio/content/examples/dynamic-component-loader/src/app/ad-banner.component.ts

@@ -20,7 +20,7 @@ import { AdComponent } from './ad.component';
 export class AdBannerComponent implements OnInit, OnDestroy {
   @Input() ads: AdItem[];
   currentAdIndex = -1;
-  @ViewChild(AdDirective) adHost: AdDirective;
+  @ViewChild(AdDirective, {static: true}) adHost: AdDirective;
   interval: any;
 
   constructor(private componentFactoryResolver: ComponentFactoryResolver) { }