Completed Revised New Text Channel Modal to Facilitate the Transition from Group Chats to Text Channels

[ColinLefter]

Summary of Changes

• added a channel name input field
• added a member list combobox
• added client-side validation for the case where the user clicks on "Create text channel" without entering any information or leaving either the channel name or the channel members input empty
• modified the update-message-history endpoint to only update message history for existing chats and not also create a new chat if one does not already exist (now we are guaranteed to have an existing chat as you can only get there via the Plus icon).
• fixed all broken Jest tests under the __tests__ directory (took way too long)
• added 2 tests that simulate a) the front-end call to the backend API that handles chat creation and b) the internal processes that happen within the backend API
• ensured synchronization between the member list and admin list input boxes such that deleting a user from the member list also deletes them from the admin list
• removed two outdated test cases
• moved the generateHash function to a utility file in the application directory called utility.ts
• modified MessagingInterface to reflect the migration of the hashing function to utility.ts

Visual Summary of Changes

All tests passing (including those that are not specific to this pull request)

Valid inputs

Attempting to add a user as admin without adding them as a member

(Client-side validation): Attempting to submit the form without filling out anything

(Client-side validation): Attempting to submit the form without filling out a particular required field

Notification upon created text channel

MongoDB synchronization

(Client-side validation): Attempting to create a text channel that already exists (same name + members)

Known Issues

• Starting a chat by clicking on a friend and having the privacy toggle off will likely cause a runtime error as we need to be running a query upon clicking a user to facilitate DMs.