Communication: Duplicate group chat creation with same users

[asliayk]

Describe the bug

It is currently possible to create multiple group chats with the exact same users. This behavior results in redundancy and confusion. The system should prevent duplicate group chats with identical participants.

To Reproduce

1. Go to the Communication section of a course.
2. Click on the "Create Group Chat" button that appears after clicking the plus button.
3. Create a group chat.
4. Repeat the previous group chat creation steps and notice that two group chats with the exact same users can be created.

Expected behavior

When creating a group chat with the same users, the system should return the existing group chat or prevent the duplicate.

Screenshots

Which version of Artemis are you seeing the problem on?

7.7.5

What browsers are you seeing the problem on?

Chrome

Additional context

No response

Relevant log output

No response