Clean up jest (#50177)

src/observability/tests/failbot.js

@@ -38,7 +38,7 @@ describe('FailBot', () => {
       const backendPromises = FailBot.report(err, { foo: 'bar' })
       // Note! You don't need to await the promises it returns to be
       // able to use `FailBot.report()`. It will send.
-      // But here in the context of jest, we need to await *now*
+      // But here in the context of vitest, we need to await *now*
       // so we can assert that it did make the relevant post requests.
       // Once we've done this, we can immediate check what it did.
       await Promise.all(await backendPromises)