fix(ui-components): throw on failed publish

[avivkeller]

Ref: #8091 (comment)

cc @nodejs/web-infra

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Project	Deployment	Preview	Updated (UTC)
nodejs-org	Ready	Preview	Aug 20, 2025 8:31pm

[Copilot]

Pull Request Overview

This PR adds error handling to the npm package publishing script to ensure failures are properly reported and handled. The change addresses an issue where the publish command could fail silently.

• Captures the return status and error from the spawnSync command
• Throws an error if the spawn operation itself fails
• Sets the process exit code to reflect the publish command's status

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.17%. Comparing base (660f38f) to head (2cbbc57).
⚠️ Report is 6 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8093      +/-   ##
==========================================
+ Coverage   73.12%   73.17%   +0.04%     
==========================================
  Files          97       97              
  Lines        8440     8440              
  Branches      229      228       -1     
==========================================
+ Hits         6172     6176       +4     
+ Misses       2267     2263       -4     
  Partials        1        1              

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[github-actions]

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