Add scripts to update examples to cypress@latest

[MikeMcC399]

This PR implements the suggestion from #767 "Automated examples update to latest Cypress version" by providing a new npm script command:

npm run update:cypress

to update Cypress examples to the latest version of Cypress. (The v9 examples are untouched and left at version 9.7.0.)

The process is documented in docs/MAINTENANCE.md.

1. update-cypress-latest.sh is the main script
2. update-cypress-latest-npm.sh updates examples using npm
3. update-cypress-latest-other.sh updates examples using yarn and pnpm

The npm run check:markdown script is extended to check also the new docs/ directory.

The previous script scripts/npm-install-examples.sh is replaced.

[MikeMcC399]

Tested locally on Ubuntu 22.04 and Windows 11 Pro.

[MikeMcC399]

@jaffrepaul

I successfully ran this to update to Cypress 12.5.1, so from my point of view this PR is ready to merge.

It's also non-critical in the sense that it is purely a maintenance tool. It is not called by the action itself or by the examples.

I haven't submitted a PR with the actual update to Cypress 12.5.1 waiting in branch update/examples-to-12-5-1. Perhaps 12.6. is around the corner and it would be better to wait? Cypress 12.6.0 has been released, so I did that instead (PR #795).

[CLAassistant]

All committers have signed the CLA.

[MikeMcC399]

This is now modified to save exact versions of Cypress i.e. 12.7.0 not ^12.7.0 also if the scripts are run directly, for instance
./scripts/update-cypress-latest-npm.sh instead of being run using npm run cypress:update.

In the latter case they already took the setting save-exact=true from .npmrc.

[github-actions]

🎉 This PR is included in version 5.2.0 🎉

The release is available on:

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

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