Perform dead code analysis with Knip (#2575)

* Install Knip

* Clarify an import that was confusing Knip

* Fix issues detected by Knip

Including cleaning up some unused code and dependencies, using a React hook that we unintentionally stopped using, and also adding some previously undeclared dependencies.

* Run dead code analysis in lint script and CI

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Co-authored-by: Timo <toger5@hotmail.de>

src/room/RoomPage.tsx

@@ -35,10 +35,7 @@ import { LobbyView } from "./LobbyView";
 import { E2eeType } from "../e2ee/e2eeType";
 import { useProfile } from "../profile/useProfile";
 import { useMuteStates } from "./MuteStates";
-import {
-  useSetting,
-  optInAnalytics as optInAnalyticsSetting,
-} from "../settings/settings";
+import { useOptInAnalytics } from "../settings/settings";
 
 export const RoomPage: FC = () => {
   const {
@@ -83,7 +80,7 @@ export const RoomPage: FC = () => {
     registerPasswordlessUser,
   ]);
 
-  const [optInAnalytics, setOptInAnalytics] = useSetting(optInAnalyticsSetting);
+  const [optInAnalytics, setOptInAnalytics] = useOptInAnalytics();
   useEffect(() => {
     // During the beta, opt into analytics by default
     if (optInAnalytics === null && setOptInAnalytics) setOptInAnalytics(true);