* Final update copyright headers to reference license files at the repo root
Signed-off-by: spham <spham@amazon.com>
* Fix copyright validator unit tests to support the stale O3DE header scenario
Signed-off-by: spham <spham@amazon.com>
The actual bug was the "if (!m_engine)" early-out in CreateInstanceNode that needed to be removed, but all the rest of this legacy-based merged mesh code was ripe for removal as well.