fix(nvm): duplicated code

[avivkeller]

Ref https://openjs-foundation.slack.com/archives/C03BJP63CH0/p1756941182705769

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Project	Deployment	Preview	Updated (UTC)
nodejs-org	Ready	Preview	Sep 3, 2025 11:20pm

[Copilot]

Pull Request Overview

This PR removes duplicated code from the nvm installation script by eliminating redundant verification commands. The change streamlines the script by keeping only the essential installation step.

• Removes duplicate Node.js version verification commands
• Simplifies the nvm installation snippet to focus on core installation

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.59%. Comparing base (769d710) to head (8ac3389).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8153   +/-   ##
=======================================
  Coverage   76.59%   76.59%           
=======================================
  Files         115      115           
  Lines        9602     9602           
  Branches      322      322           
=======================================
  Hits         7355     7355           
  Misses       2246     2246           
  Partials        1        1           

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[MattIPv4]

Speedy

[MattIPv4]

Marking this as fast-track, given it is a fix for a noticeable/noticed issue on a highly visible page