Discrepancy between the start time for a cadence and the time of actual observation

[jchate6]

Currently, the ResumeCadenceAfterFailureStrategy triggers a new cadence based on the start of the initial window rather than the actual successful observation.
Users would like to change this to more accurately reflect the preferred behavior of the next cadence beginning at the end of the observation.

i.e. if I want an observation every 7 days, but give myself a 3 day window, I want my next window to start 7 days after the successful observation, not after the beginning of my window.