Clicking pause doesn't freeze Node Details data

[fbarl]

From Slack:

matthias [3:27 PM]
when hitting 'pause' in scope in dev I still see things moving in the details panel, e.g. metrics are changing. I thought this should all be looking at a specific point in time?

filip
[3:32 PM]
...what's happening is that clicking pause stops updating the nodes through websockets (those deltas are buffered in the UI), but when node details are open, there are additional periodic requests to the API being made for that node and we aren't pausing those..

Proper solution would require using updatePausedAt timestamp when querying the API for node details info, but currently that timestamp is always calculated from the timeTravelMillisecondsInPast value. Once #2651 is merged, fixing this will be much simpler as only one source of truth will be used.