Revert "Revert "Factor out MessageEvent.from() usage (#9882)""

This reverts commit 99e38ca88e.

cypress/e2e/editing/editing.spec.ts

@@ -16,15 +16,17 @@ limitations under the License.
 
 /// <reference types="cypress" />
 
-import { MessageEvent } from "matrix-events-sdk";
-
+import type { MsgType } from "matrix-js-sdk/src/@types/event";
 import type { ISendEventResponse } from "matrix-js-sdk/src/@types/requests";
 import type { EventType } from "matrix-js-sdk/src/@types/event";
 import { SynapseInstance } from "../../plugins/synapsedocker";
 import Chainable = Cypress.Chainable;
 
 const sendEvent = (roomId: string): Chainable<ISendEventResponse> => {
-    return cy.sendEvent(roomId, null, "m.room.message" as EventType, MessageEvent.from("Message").serialize().content);
+    return cy.sendEvent(roomId, null, "m.room.message" as EventType, {
+        msgtype: "m.text" as MsgType,
+        body: "Message",
+    });
 };
 
 describe("Editing", () => {