task: #3636734 Use @webship-js/drupal-core-steps 2.1 for the webship-js suite and refresh the dependencies

Summary

The webship-js suite runs on the public step pack @webship-js/drupal-core-steps (^2.1.0) instead of local copies of the steps it provides, and CI runs a dry run before the browser job, so an undefined or ambiguous step fails early.

Changes

• package.json: adds @webship-js/drupal-core-steps ^2.1.0 to the devDependencies (webship-js is already ^2.0.6, the pack's peer range) and adds the test:dry script (cucumber-js --dry-run); moves engines to node >= 24.0 and yarn >= 4.18.1 and packageManager from yarn@4.9.3 to yarn@4.18.1.
• cucumber.js: adds the pack's step glob between the webship-js glob and the project's own. The users registry already has the pack's shape (username, email, password, roles, isAdmin).
• tests/step-definitions/cucumber_default_content.steps.js: removes the custom login by handle and I add the testing users steps, which match the same sentences as the pack's. The project's own steps stay.
• .gitlab-ci.yml: the webship-js-test job runs cucumber-js --dry-run before the suite, so an undefined or ambiguous step fails early; the cspell and lint jobs move from node:20 to node:24; YARN_ENABLE_IMMUTABLE_INSTALLS: "false" lets a job update yarn.lock instead of failing, because Yarn 4 makes installs immutable on CI; .composer-base points Drupal core's own Yarn 4.9.1 at .yarnrc.core.yml, so the composer job does not read the project's .yarnrc.yml, whose npmMinimalAgeGate setting Yarn 4.9.1 rejects.
• .gitlab-ci.yml: the browser job uninstalls the Update Manager after the module install; its error message "There is a security update available for your version of Drupal" made the pack's I add the testing users fail, so the users the suite logs in as were never created. The suite does not use the Update Manager.
• .yarnrc.yml: adds npmMinimalAgeGate: 0, because Yarn 4.18.1 quarantines packages younger than a day by default (npmMinimalAgeGate is 1440 minutes) and the Webship step packs are released often.
• yarn.lock: refreshed for the new pack and Yarn 4.18.1. This project commits its lock file, and yarn install --immutable passes with it.

Dry run on Node 24.22.2 from a fresh clone of this branch: 6 scenarios, 26 steps, none undefined or ambiguous.

Issue

Issue: https://www.drupal.org/node/3636734

AI-Generated: Yes (configuration and step cleanup; reviewed by Rajab Natshah.)

Checkpoints:

• File an issue
• Addition/Change/Update/Fix
• Testing to ensure no regression
• Automated unit testing coverage
• Automated functional testing coverage
• UX/UI designer responsibilities
• Readability
• Accessibility
• Performance
• Security
• Developer Documentation
• User Guide Documentation
• Reviewed by human
• Code review by maintainers
• Full testing and approval
• Credit contributors
• Review with the product owner
• Release notes snippet
• Release