feat: inform participants of canceled meetings - WPB-25517

[acv-w]

WPB-25517 [iOS] Inform participant of a canceled meeting

Issue

Participants are not notified when a host deletes a scheduled meeting.

This change:

• Generates a native cancellation notification before the meeting is removed locally.
• Shows the meeting title and host display name.

Testing

Using separate host and participant accounts:

1. Enable wireMeetings and the team meetings flag.
2. Create a scheduled meeting and invite the participant.
3. Wait for it to appear in the participant’s Meetings list.
4. Delete and confirm deletion from the host client.
5. Verify the meeting disappears without interacting with the notification.
6. Verify:
   • Title is the meeting title.
   • Body is By <Host Display Name> canceled this meeting.
   • Tapping does not navigate.

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Checklist

• Title contains a reference JIRA issue number like [WPB-XXX].
• Description is filled and free of optional paragraphs.
• Adds/updates automated tests.

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UI accessibility checklist

If your PR includes UI changes, please utilize this checklist:

• Make sure you use the API for UI elements that support large fonts.
• All colors are taken from WireDesign.ColorTheme or constructed using WireDesign.BaseColorPalette.
• New UI elements have Accessibility strings for VoiceOver.

[github-actions]

Test Results – batch 0

  2 files  186 suites   21s ⏱️
993 tests 993 ✅ 0 💤 0 ❌
994 runs  994 ✅ 0 💤 0 ❌

Results for commit 50a0331.

♻️ This comment has been updated with latest results.

[github-actions]

Test Results – batch 1

    2 files    381 suites   5m 15s ⏱️
3 533 tests 3 532 ✅ 0 💤 1 ❌
3 533 runs  3 533 ✅ 0 💤 0 ❌

For more details on these failures, see this check.

Results for commit 50a0331.

♻️ This comment has been updated with latest results.

[datadog-wireapp]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 50a0331 | Docs | Datadog PR Page | Give us feedback!}

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