Compile errors in GPU scripts aren't always reported to the Niagara Log

The Niagara log will not always show compilation errors for GPU particles. The errors are visible in the output log.

1. Create a Niagara system based on any template
2. Set the Sim Target to GPUCompute Sim
3. Add a new scratch pad module to Particle Update
4. In the scratch pad module add a custom HLSL node and include a typo or other mistake to cause a compilation failure
5. Compile the system, it may take several tries

RESULT

The Niagara log should raise the compilation issues with the custom node, but can sometimes fail to show it. The repro rate can be sporadic. A customer seems to be hitting this nearly 100%. On different CLs I've seen repro rates at ~50% and some closer to 10%.