Implement grey status for stages until touchpoints are refreshed

[JimHagan]

Previously when stages or steps were edited there would be a state when stages could go RED or ALL green while touchpoints were in an ambiguous state. this code adds a "grey" status for stages which remains until touchoints are in a determined state. This is the actionable code:

  if (stage.status_color === 'danger') {
    healthIcon = dangerHeart;
  }
  else if (stage.status_color === 'good') {
    healthIcon = goodHeart;
  }
  else if (stage.status_color === 'warning') {
    healthIcon = warningHeart;
  }