fix(router): do not finish bootstrap until all the routes are resolved (#14762)

DEPRECATION:

Use `RouterModule.forRoot(routes, {initialNavigation: 'enabled'})` instead of
`RouterModule.forRoot(routes, {initialNavigtaion: true})`.

Before doing this, move the initialization logic affecting the router
from the bootstrapped component to the boostrapped module.

Similarly, use `RouterModule.forRoot(routes, {initialNavigation: 'disabled'})`
instead of `RouterModule.forRoot(routes, {initialNavigation: false})`.

Deprecated options: 'legacy_enabled', `true` (same as 'legacy_enabled'),
'legacy_disabled', `false` (same as 'legacy_disabled').

The "Router Initial Navigation" design document covers this change.
Read more here:
https://docs.google.com/document/d/1Hlw1fPaVs-PCj5KPeJRKhrQGAvFOxdvTlwAcnZosu5A/edit?usp=sharing

modules/playground/src/web_workers/router/index_common.ts

@@ -25,7 +25,9 @@ export const ROUTES = [
 
 @NgModule({
   imports: [WorkerAppModule, RouterModule.forRoot(ROUTES, {useHash: true})],
-  providers: [WORKER_APP_LOCATION_PROVIDERS],
+  providers: [
+    WORKER_APP_LOCATION_PROVIDERS,
+  ],
   bootstrap: [App],
   declarations: [App, Start, Contact, About]
 })