Fix pulse time

[micahwoodard]

Fixes bug where reward time is not reset after flushing valves. Now, reward time is reset after spouts are flushed. Confirmed that after flushing, reward amount returns to reward volume.

[micahwoodard]

Updated the workflow to have a SetRightRewardAmount subject to trigger calculation of reward. Sets right and left in init and controlled independently in calibration

[bruno-f-cruz]

I think if we are doing this, we may as well future-proof it and have "SetRightRewardAmount" be a Tuple<Bool, float> similar to SetIsRightValveMs. Once we do that, SetIsRightValveMs will become private to the OperationControl scope (currently a global subject shared with the UI components) and the flush will instead use the SetRightRewardAmount, which becomes the public interface. The advantage is that it gives an obvious interface to implement single-trial-level reward amount modification in the future, should we need it.