test: Replace react-scripts example by nextjs example

[MikeMcC399]

This PR resolves #866 "Deprecations related to examples/react-scripts".

It implements the suggestion to replace examples/react-scripts by a new example based on Start a New React Project using Next.js.

The setup follows Create a Next.js App.

Changes

1. examples/react-scripts is removed.
2. In its place examples/nextjs is added.
3. The workflow .github/workflows/example-wait-on.yml is modified to use examples/nextjs instead of examples/react-scripts.
4. The scripts/update-cypress-latest-npm.sh is modified to update examples/nextjs to cypress@latest instead of examples/react-scripts.

Verification

Local

Execute:

npm ci
npm outdated
npm audit
npm run update:cypress

and ensure

1. no errors are reported
2. no out-of-date dependencies are reported
3. 0 vulnerabilities are reported

GitHub

Examine workflow log from https://github.com/cypress-io/github-action/actions/workflows/example-wait-on.yml and ensure that the jobs:

• wait-on-nextjs
• wait-using-custom-command

complete successfully.

wait-on is using localhost showing that the workaround of 127.0.0.1 needed for the react-scripts example is not necessary for nextjs

[jordanpowell88]

LGTM. Great job @MikeMcC399

[jaffrepaul]

Good stuff. Thanks Mike!

[MikeMcC399]

@jordanpowell88 / @jaffrepaul

Thanks guys! The difficult part is mostly figuring out what the right solution should be. Implementing it is often relatively straightforward.

[github-actions]

🎉 This PR is included in version 5.6.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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