Enable lint rules for Promise handling to discourage misuse of them. (#2607)

* Enable lint rules for Promise handling to discourage misuse of them.
Squashed all of Hugh's commits into one.

---------

Co-authored-by: Hugh Nimmo-Smith <hughns@element.io>

src/settings/RageshakeButton.tsx

@@ -8,6 +8,7 @@ Please see LICENSE in the repository root for full details.
 import { useTranslation } from "react-i18next";
 import { FC, useCallback } from "react";
 import { Button } from "@vector-im/compound-web";
+import { logger } from "matrix-js-sdk/src/logger";
 
 import { Config } from "../config/Config";
 import styles from "./RageshakeButton.module.css";
@@ -25,6 +26,8 @@ export const RageshakeButton: FC<Props> = ({ description }) => {
     submitRageshake({
       description,
       sendLogs: true,
+    }).catch((e) => {
+      logger.error("Failed to send rageshake", e);
     });
   }, [submitRageshake, description]);