test: set npm allow-scripts for cypress

[MikeMcC399]

• closes allow-scripts warning on Node.js 26.3.0 #1782

Situation

When the .github/workflows/example-node-versions.yml is run, it now outputs a warning for Node.js 26

npm warn allow-scripts 1 package has install scripts not yet covered by allowScripts:
npm warn allow-scripts   cypress@15.16.0 (postinstall: node dist/index.js --exec install)
npm warn allow-scripts
npm warn allow-scripts Run `npm approve-scripts --allow-scripts-pending` to review, or `npm approve-scripts <pkg>` to allow.

Node.js 26.3.0 is installed with bundled npm 11.16.0

Change

Running under Node.js 26.3.0 (with npm 11.16.0), and for all npm-based Cypress examples, apply:

npm approve-scripts cypress --no-allow-scripts-pin

Use a copy of scripts/update-cypress-latest-npm.sh to assist looping through all sub-directories.

For examples/nextjs additionally allow sharp as a dependency of next since it requires node-gyp to rebuild.

---

Note

Low Risk
Example-only package.json metadata changes; no runtime or CI workflow logic is modified beyond silencing npm install-script warnings.

Overview
Adds npm allowScripts configuration to every npm-based Cypress example package.json so installs under Node.js 26 / npm 11 no longer emit allow-scripts warnings about Cypress’s postinstall.

Each example now sets "cypress": true under allowScripts. examples/nextjs also allows sharp (Next.js dependency with native install scripts).

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