Remove experimental warning from next/jest (vercel#34096)

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `yarn lint`

packages/next/build/jest/jest.ts

@@ -25,10 +25,6 @@ function loadClosestPackageJson(dir: string, attempts = 1): any {
   }
 }
 
-console.warn(
-  '"next/jest" is currently experimental. https://nextjs.org/docs/messages/experimental-jest-transformer'
-)
-
 /*
 // Usage in jest.config.js
 const nextJest = require('next/jest');