chore: member list is randomly sorted

[Arin13-03]

Issue: ( #22145)
The current implementation of the channels.members endpoint does not provide members in alphabetical order, causing inconvenience to users who expect a sorted list. This issue makes it challenging for users to locate specific members without using the search functionality.

Changes Made:
In this pull request, I have addressed the sorting issue by modifying the channels.members endpoint to ensure that the member list is sorted alphabetically by username before being returned in the API response. This enhancement will provide users with a more organized and easily navigable member list within channels.

Testing:
I have thoroughly tested the changes to ensure their correctness and effectiveness:

1. Created test cases to validate the sorting functionality, covering scenarios with different numbers of members and usernames with special characters.
2. Conducted manual testing of the endpoint in various environments to verify consistent alphabetical sorting.
3. Confirm that the member list is now presented in alphabetical order as expected.

Dependencies:
This pull request introduces no new dependencies. The sorting logic leverages the localeCompare() function to ensure accurate alphabetical sorting based on user usernames.

Additional Notes:
The proposed changes aim to enhance the user experience by providing a more intuitive and organized member list within channels. By sorting members alphabetically, we aim to streamline navigation and improve user satisfaction.

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Latest commit: df8f331

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