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/home/RegisteredView.tsx

@@ -40,10 +40,7 @@ import { Caption } from "../typography/Typography";
 import { Form } from "../form/Form";
 import { AnalyticsNotice } from "../analytics/AnalyticsNotice";
 import { E2eeType } from "../e2ee/e2eeType";
-import {
-  useSetting,
-  optInAnalytics as optInAnalyticsSetting,
-} from "../settings/settings";
+import { useOptInAnalytics } from "../settings/settings";
 
 interface Props {
   client: MatrixClient;
@@ -52,7 +49,7 @@ interface Props {
 export const RegisteredView: FC<Props> = ({ client }) => {
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState<Error>();
-  const [optInAnalytics] = useSetting(optInAnalyticsSetting);
+  const [optInAnalytics] = useOptInAnalytics();
   const history = useHistory();
   const { t } = useTranslation();
   const [joinExistingCallModalOpen, setJoinExistingCallModalOpen] =

src/home/UnauthenticatedView.tsx

@@ -43,16 +43,13 @@ import { generateRandomName } from "../auth/generateRandomName";
 import { AnalyticsNotice } from "../analytics/AnalyticsNotice";
 import { Config } from "../config/Config";
 import { E2eeType } from "../e2ee/e2eeType";
-import {
-  useSetting,
-  optInAnalytics as optInAnalyticsSetting,
-} from "../settings/settings";
+import { useOptInAnalytics } from "../settings/settings";
 
 export const UnauthenticatedView: FC = () => {
   const { setClient } = useClient();
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState<Error>();
-  const [optInAnalytics] = useSetting(optInAnalyticsSetting);
+  const [optInAnalytics] = useOptInAnalytics();
   const { recaptchaKey, register } = useInteractiveRegistration();
   const { execute, reset, recaptchaId } = useRecaptcha(recaptchaKey);