Feature: Delete Channel

[eylulnc]

Problem Description

The delete channel functionality was previously available only on the web version of Artemis. However, there was no implementation for Android, preventing moderators from deleting channels within the mobile app.

Changes

✔️ Implemented channel deletion functionality in the Conversation Settings screen.
✔️ Added a confirmation dialog before deletion to prevent accidental removals.
✔️ Integrated API call to delete the channel, ensuring consistency with the web version.
✔️ Updated UI elements to reflect the deletion process correctly.
✔️ Implemented end-to-end tests (ChannelSettingsE2eTest) to verify the functionality.

Steps for testing

PS - While I test Test User 8 (Tutor) and Test User 11 (Editor) had weird behavior but when I compare with the other Tutor and Editors everything looked okay. Maybe their role has been changed. Also in the web app they can see the buttons but other Tutors and Editors cant.

Test Case 1 - Student/Tutor/Editor

1. Navigate to Conversation Settings of a channel.
2. Verify the Delete Channel button is not visible for users without moderation rights.

Test Case 2 - Moderator

1. Navigate to Conversation Settings of a channel.
2. Verify the Delete Channel button is visible for users with moderation rights.
3. Click Delete Channel, and ensure a confirmation dialog appears.
   Confirm deletion and check:
   - The channel is removed from the overview.
   - The user is redirected to conversation overview.

Screenshots

[FelberMartin]

Nice, I tested the functionality, works as described :)

[julian-wls]

Nice change, worked as expected :)

Code lgtm, I agree with Martin regarding the points mentioned, should be good to go once the changes are made