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/submit-rageshake.ts

@@ -300,10 +300,14 @@ export function useRageshakeRequest(): (
 
   const sendRageshakeRequest = useCallback(
     (roomId: string, rageshakeRequestId: string) => {
-      // @ts-expect-error - org.matrix.rageshake_request is not part of `keyof TimelineEvents` but it is okay to sent a custom event.
-      client!.sendEvent(roomId, "org.matrix.rageshake_request", {
-        request_id: rageshakeRequestId,
-      });
+      client!
+        // @ts-expect-error - org.matrix.rageshake_request is not part of `keyof TimelineEvents` but it is okay to sent a custom event.
+        .sendEvent(roomId, "org.matrix.rageshake_request", {
+          request_id: rageshakeRequestId,
+        })
+        .catch((e) => {
+          logger.error("Failed to send org.matrix.rageshake_request event", e);
+        });
     },
     [client],
   );