93219: Support Router in InitService

For Router to work properly, APP_BASE_HREF must be resolved _before_ the APP_INITIALIZER factory is called (otherwise Angular will attempt to initialize APP_BASE_HREF too soon)
To fix this we add a pre-initialization hook to APP_CONFIG so BrowserInitService can resolve it before APP_INITIALIZER

src/modules/app/server-init.service.ts

@@ -29,7 +29,7 @@ export class ServerInitService extends InitService {
     super(store, correlationIdService, dspaceTransferState);
   }
 
-  public init(): () => Promise<boolean> {
+  protected init(): () => Promise<boolean> {
     return async () => {
       this.checkAuthenticationToken();
       this.saveAppConfigForCSR();