fix: timezone variable name does not match webhook payload

[Kinbaum]

What does this PR do?

Fixes an issue with the custom webhook payload. The data is returned as attendees.0.timeZone but the variable name when constructing a custom payload suggests attendees.0.timezone (note the lowercase)

Visual Demo (For contributors especially)

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

• Add console log to your API and observe the payload coming from cal.com
• Trigger a ping test to see the default payload

You will see the following payload

{
  triggerEvent: 'PING',
  createdAt: '2025-10-05T15:28:45.646Z',
  payload: {
    type: 'Test',
    title: 'Test trigger event',
    startTime: '2025-10-05T15:28:45.646Z',
    endTime: '2025-10-05T15:28:45.646Z',
    attendees: [
      {
        email: 'jdoe@example.com',
        name: 'John Doe',
        timeZone: 'Europe/London', // See the time zone here is capitalized
        language: { locale: 'en' },
        utcOffset: 60
      }
    ],
    organizer: {
      name: 'Cal',
      email: 'no-reply@cal.com',
      timeZone: 'Europe/London',
      language: { locale: 'en' },
      utcOffset: 60
    }
  }
}

[vercel]

@Kinbaum is attempting to deploy a commit to the cal Team on Vercel.

A member of the Team first needs to authorize it.

[coderabbitai]

Walkthrough

Renames the attendee timezone variable key in packages/features/webhooks/components/WebhookForm.tsx from attendees.0.timezone to attendees.0.timeZone, and updates the corresponding template placeholder from {{attendees.0.timezone}} to {{attendees.0.timeZone}}. No other fields or logic are changed.

Possibly related PRs

• feat: allow inserting webhook variables into custom payload template #22835: Modifies webhook variable definitions and insertion logic in the same WebhookForm.tsx file, closely related to this variable rename.

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title clearly and concisely describes the primary change by indicating a fix for the timezone variable name mismatch in the webhook payload, accurately reflecting the core update without extraneous details.
Description Check	✅ Passed	The pull request description clearly states the mismatch between the returned timeZone field and the expected timezone variable in custom payloads and directly relates to the changes adjusting this key, demonstrating an accurate understanding of the changeset.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[github-actions]

E2E results are ready!

• Workflow #81874.1 latest results