Convert Harness Examples to use Ivy #1037

In PR #1009, we had to revert the change to enable Ivy for the Harness Examples due to #997. The PR has a good bit of discussion about possible steps forward and some issues seen with those. The non-Harness examples are already converted to Ivy (as a reference), but they are currently all broken in StackBlitz due to some ngcc issues.

Since the goal is to remove View Engine, we need to get this working with Ivy, but this has to be done in collaboration with the StackBlitz team since the examples use their legacy engine.