Add node to eget_packages and define nodejs_version

[kenorb]

Summary by Sourcery

Add Node.js installation via eget and centralize its version configuration while removing the APT-based Node.js/npm packages from the example variables.

New Features:

• Introduce an eget package definition for Node.js that downloads the appropriate binary for the target architecture.

Enhancements:

• Add a configurable nodejs_version variable to control the Node.js version fetched by eget and document Node.js in the eget_packages list.
• Shift Node.js provisioning from APT packages to eget-based installation in the example Ansible variables.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dev-nodejs

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⛔ Workflow Failures Detected

The following job errors and annotations were found:

• Check / check / Pre-commit at .github:91: Process completed with exit code 1.
• Check / check / Pre-commit at .ansible/variables-example.yml:172: Line too long (125 > 120 characters)
• Check / check / Pre-commit at .ansible/playbooks/tasks/eget.yml:111: Line too long (122 > 120 characters)
• Check / check / Pre-commit at .ansible/playbooks/tasks/eget.yml:102: Line too long (131 > 120 characters)
• Check / check / Pre-commit at .ansible/playbooks/tasks/eget.yml:111: 111:121 [line-length] line too long (122 > 120 characters)
• Check / check / Pre-commit at .ansible/playbooks/tasks/eget.yml:102: 102:121 [line-length] line too long (131 > 120 characters)
• Check / check / Pre-commit at .ansible/variables-example.yml:172: 172:121 [line-length] line too long (125 > 120 characters)

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