fix(router): remove preserveQueryParams symbol (#38762)

Remove preserveQueryParams as it was deprecated for removal in v4, use
queryParamsHandling="preserve" instead.

BREAKING CHANGE: preserveQueryParams has been removed, use
queryParamsHandling="preserve" instead

PR Close #38762

packages/router/test/integration.spec.ts

@@ -2137,7 +2137,7 @@ describe('Integration', () => {
          @Component({
            selector: 'someRoot',
            template:
-               `<router-outlet></router-outlet><a routerLink="/home" preserveQueryParams preserveFragment>Link</a>`
+               `<router-outlet></router-outlet><a routerLink="/home" queryParamsHandling="preserve" preserveFragment>Link</a>`
          })
          class RootCmpWithLink {
          }