Replace remaining React ARIA components with Compound components (#2576)

* 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.

* Replace remaining React ARIA components with Compound components

* fix button position

* disable scrollbars to resolve overlapping button

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

src/auth/RegisterPage.tsx

@@ -28,9 +28,9 @@ import { captureException } from "@sentry/react";
 import { sleep } from "matrix-js-sdk/src/utils";
 import { Trans, useTranslation } from "react-i18next";
 import { logger } from "matrix-js-sdk/src/logger";
+import { Button } from "@vector-im/compound-web";
 
 import { FieldRow, InputField, ErrorMessage } from "../input/Input";
-import { Button } from "../button";
 import { useClientLegacy } from "../ClientContext";
 import { useInteractiveRegistration } from "./useInteractiveRegistration";
 import styles from "./LoginPage.module.css";