[web] Call update or create invite link endpoint

Summary:
Update or create a new link when a button is clicked.

https://www.figma.com/file/a1nkbWgbgjRlrOY9LVurTz/Comm-%2F-Desktop-app?node-id=11400%3A288456&mode=dev

Depends on D8416

Test Plan: Check if creating new links works. Then, check if it is possible to update it.

Reviewers: kamil, inka, bartek

Reviewed By: inka

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D8417