chore: More typescript FIXME's removed

shared/embeds/Miro.test.ts

@@ -15,8 +15,7 @@ describe("Miro", () => {
 
   test("to extract the domain as part of the match for later use", () => {
     expect(
-      // @ts-expect-error ts-migrate(2531) FIXME: Object is possibly 'null'.
-      "https://realtimeboard.com/app/board/o9J_k0fwiss=".match(match)[1]
+      "https://realtimeboard.com/app/board/o9J_k0fwiss=".match(match)?.[1]
     ).toBe("realtimeboard");
   });