Move generating of group URLs into group.ts

Release-Notes: skip
Google-Bug-Id: b/244279450
Change-Id: If0948fcae14c80edd8a6b5a380ee5b303e48de88
diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
index a1ae858..c27776a 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
@@ -20,10 +20,7 @@
   WeblinkType,
 } from '../gr-navigation/gr-navigation';
 import {getAppContext} from '../../../services/app-context';
-import {
-  convertToPatchSetNum,
-  PatchRangeParams,
-} from '../../../utils/patch-set-util';
+import {convertToPatchSetNum} from '../../../utils/patch-set-util';
 import {assertIsDefined, assertNever} from '../../../utils/common-util';
 import {
   BasePatchSetNum,
@@ -43,6 +40,7 @@
 import {windowLocationReload} from '../../../utils/dom-util';
 import {
   getBaseUrl,
+  PatchRangeParams,
   toPath,
   toPathname,
   toSearchParams,