Orquesta Tasks: Default when in task transition to succeeded

[m4dcoder]

If I recall from the UX design, the when in the task transition should have a drop down for user to choose succeeded, failed, completed, and additional option to customize it. Since there's no drop down in the current version, it will be nice to default when to <% succeeded() %> and the color to green so user knows what value is expected.

[LindsayHill]

Related: we should set default transition arrow colors based upon presence of succeeded() or failure() in when: clause.

Currently all default to same color, regardless of success/failure/otherwise