ContextOrGroupOrInterrupt blocks until one of 3 things happens: the context deadline is met (if one exists), the wait group's Wait() function naturally unblocks, or we receive a SIGINT/SIGTERM signal.

InterruptSignal creates a channel that will accept the next SIGTERM or SIGINT signal the OS sends to this process.

WithTimeout waits for the given wait group to complete normally unless the given amount of time has passed.