Aeyb/#157 ticking people off on the fe

[TylerDonghwi]

Closes: [Replace this with what ticket iter it closed e.g. #12]

What was done:

• added buttons that opens a modal to modify attendance
• the buttons are only visible if you have "MANAGE_MEETING" perm
• you can update the attendance
• end meeting in the live meeting card
• disabled post meeting feedback submission
• disabled live meeting screen

Backend

• added a new endpoint to update the entire attendance array for a meeting
• this throws an error but it works

How to test:

• test the modal
• see if there is a way to break it

Screenshots of UI changes (optional):

- I know colour choices weren't the best but someone else can change it lol.