fix(ci): pass webhook through to notify-on-push action

[MattIPv4]

Description

https://github.com/nodejs/nodejs.org/actions/runs/18669937464/job/53228682825

Validation

Admin merge this PR.

Related Issues

N/A

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run pnpm format to ensure the code follows the style guide.
• I have run pnpm test to check if all tests are passing.
• I have run pnpm build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

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[Copilot]

Pull Request Overview

This PR adds Slack webhook configuration to the notify-on-push GitHub Action to enable notifications when code is pushed to the repository. The change addresses a workflow failure where the webhook parameter was missing.

Key Changes:

• Added webhook parameter to the notify-on-push action, passing it from GitHub secrets

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.36%. Comparing base (6af8e13) to head (ba0a893).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8252      +/-   ##
==========================================
- Coverage   76.40%   76.36%   -0.05%     
==========================================
  Files         115      115              
  Lines        9647     9647              
  Branches      317      318       +1     
==========================================
- Hits         7371     7367       -4     
- Misses       2274     2278       +4     
  Partials        2        2              

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