fix: remove nested block_on call in cuda_execute

[0ax1]

cuda_execute itself is async so we can't run a nested block_on. In the grand scheme of things, the mechanisms to allocate CUDA pinned host and device memory, as well as copying host memory to the device need to be reworked as outlined in the added TODO comment.

[codspeed-hq]

Merging this PR will degrade performance by 15.51%

❌ 2 regressed benchmarks
✅ 1099 untouched benchmarks
⏩ 1522 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	bitwise_not_vortex_buffer_mut[128]	317.8 ns	376.1 ns	-15.51%
❌	Simulation	bitwise_not_vortex_buffer_mut[1024]	477.2 ns	535.6 ns	-10.89%

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_{Comparing ad/buffer-movement (05b9a5d) with develop (cda251b)}

Footnotes

1. 1522 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩