test: create channel convo (WPB-25729)

[emmaoke-w]

https://wearezeta.atlassian.net/browse/WPB-25729

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

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What's new in this PR?

• Adds channel test coverage for the creator-driven delete flow in ChannelTest
• Covers the flow of returning to the conversation list, long-pressing the channel, opening delete actions, confirming removal, and validating the removed state.
• Verifies the delete confirmation modal and removed toast behavior in the channel flow.

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Testing

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References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

[CinnamonNinja]

LGTM! I have a small suggestion regarding the supported protocols, but it's not needed for this test that you wrote.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud