[fixusageoutsidejest] Allow import outside of jest (#1018)

## Summary:
The `wait` function copied from Webapp verified that jest was in use at import. This worked when in webapp and it was just a file being imported, but now it's in Wonder Stuff Testing, it causes an error if any of the non-jest code is used outside of a jest environment, which is not what we want at all.

So, this removes that module level check, which in turn means Wonder Stuff Testing can be used in non-jest contexts, like stories.

See [Slack thread](https://khanacademy.slack.com/archives/CEA6W0F6F/p1707955461083099?thread_ts=1707867450.595019&cid=CEA6W0F6F) for more context, if you have access.

Issue: XXX-XXXX

## Test plan:
`yarn test`

Once published, we can update webapp and verify `dataFactoryFor` is usable within stories.

Author: somewhatabstract

Reviewers: somewhatabstract, jeresig, evanchaney, jeremywiebe

Required Reviewers:

Approved By: jeresig

Checks: ✅ Test (macos-latest, 20.x), ✅ codecov/project, ✅ CodeQL, ✅ Lint, typecheck, and coverage check (ubuntu-latest, 20.x), ✅ Prime node_modules cache for primary configuration (ubuntu-latest, 20.x), ✅ Analyze (javascript), ✅ gerald, ⏭️  dependabot

Pull Request URL: #1018

.changeset/chatty-cobras-roll.md

@@ -0,0 +1,5 @@
+---
+"@khanacademy/wonder-stuff-testing": patch
+---
+
+Allow Wonder Stuff Testing to be imported outside of jest

packages/wonder-stuff-testing/src/jest/wait.ts

@@ -1,8 +1,5 @@
 import {verifyRealTimers} from "./internal/verify-real-timers";
 import {unverifiedWait} from "./internal/unverified-wait";
-import {assertJest} from "./internal/assert-jest";
-
-assertJest();
 
 type WaitOptions = {
     /**