Fix GetUnitaryFidelity() model (and WSL CUDA preview)

Andrea's model for fidelity estimation,

F = Π (1-ɛ_j) (for j events where ɛ less than SDRP threshold),

discussed in release v8.3.0, works. Dan's confusion was largely over definition and convention. The results it produces are usually very numerically similar to v8.3 and v8.4, but the model makes more theoretical sense.

Also, we include a preview release for GPU acceleration on WSL, Ubuntu 22.04 LTS with an NVIDIA RTX 3080, running on QEngineCUDA. Generally, QEngineOCL is still preferred in the most common cases, but users should note, it's now possible to build from source based on either OpenCL and CUDA, such that true HPC scale simulation might benefit from NVLink with a QEngineCUDA source build.

File SHA-1 sums:

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