Bor handle burned ws event

[harshilsharma63]

Summary

Handled WebSocket event for when a user burns a burn-on-read message for themselves.

Ticket Link

Fixes https://mattermost.atlassian.net/browse/MM-66911

Checklist

• Added or updated unit tests (required for all new features)
• Has UI changes
• Includes text changes and localization file updates
• Have tested against the 5 core themes to ensure consistency between them.
• Have run E2E tests by adding label E2E iOS tests for PR.

Device Information

This PR was tested on: iOS emulator

Screenshots

NA

Release Note

Handled WebSocket event for when a user burns a burn-on-read message for themselves.

[github-actions]

Coverage Comparison Report

Generated on December 12, 2025 at 03:18:14 UTC

+-----------------+------------+------------+-----------+
| Metric          | Main       | This PR    | Diff      |
+-----------------+------------+------------+-----------+
| Lines           |     86.18% |     86.18% |     0.00% |
| Statements      |     86.06% |     86.06% |     0.00% |
| Branches        |     72.61% |     72.62% |     0.01% |
| Functions       |     85.40% |     85.40% |     0.00% |
+-----------------+------------+------------+-----------+
| Total           |     82.56% |     82.56% |     0.00% |
+-----------------+------------+------------+-----------+

[larkox]

nitpick: We have now three possible returns: null, {} and {error}. Any strong reason not to return {} in all the cases where we return null?

[harshilsharma63]

Done.

[harshilsharma63]

Done.

[pvev]

🎉