Add session ID and source to client activity loop

[f0ssel]

Right now we call update workspace usage with an app name and that results in the activity of the workspace being bumped. If we add a label field where we can see which client bumped the activity last and for what reason, it can help us debug issues. Additionally, a session ID can be used to debounce multiple bump calls in quick succession and be confident in the number of clients that are trying to connect (instead of counting every call as a new session).