fix(router): remove duplicated getOutlet function (#39764)

The codebase currently contains two `getOutlet` functions,
and they can end up in the bundle of an application.
A recent commit 6fbe21941d tipped us off
as it introduced several `noop` occurrences in the golden symbol files.
After investigating with @petebacondarwin,
we decided to remove the duplicated functions.

This probably shaves only a few bytes,
but this commit removes the duplicated functions,
by always using the one in `router/src/utils/config`.

PR Close #39764

packages/core/test/bundling/router/bundle.golden_symbols.json

@@ -1379,9 +1379,6 @@
   {
     "name": "getOutlet"
   },
-  {
-    "name": "getOutlet"
-  },
   {
     "name": "getOwnDefinition"
   },

packages/router/src/recognize.ts

@@ -14,6 +14,7 @@ import {ActivatedRouteSnapshot, inheritedParamsDataResolve, ParamsInheritanceStr
 import {defaultUrlMatcher, PRIMARY_OUTLET} from './shared';
 import {mapChildrenIntoArray, UrlSegment, UrlSegmentGroup, UrlTree} from './url_tree';
 import {forEach, last} from './utils/collection';
+import {getOutlet} from './utils/config';
 import {TreeNode} from './utils/tree';
 
 class NoMatch {}
@@ -328,10 +329,6 @@ function emptyPathMatch(
   return r.path === '' && r.redirectTo === undefined;
 }
 
-function getOutlet(route: Route): string {
-  return route.outlet || PRIMARY_OUTLET;
-}
-
 function getData(route: Route): Data {
   return route.data || {};
 }