Add mirror-url parameter to allow downloading Node.js from a custom URL

[aparnajyothi-y]

Description: This PR introduces a new mirror-url parameter that allows users to specify a custom mirror for downloading Node.js. This feature provides flexibility for environments where the default Node.js download mirrors are not accessible or where a specific mirror is preferred.

Related issue: Add link to the related issue.

Check list:

Mark if documentation changes are required. Mark if tests were added or updated to cover the changes.