Issue #3569160: Yarn

Mykola Podpriatovrequested to merge
3569160-fix into dev

Summary

Fix expired Yarn GPG key by using Node.js corepack instead of the Yarn apt repository. This removes the dependency on the external Yarn GPG key and uses the modern corepack approach bundled with Node.js 16.9+.

Issue

https://www.drupal.org/project/drupalci_environments/issues/3569160

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