Fix fuzzer issue template

[connortsui20]

Summary

From #6936 I do not understand why we are so against being descriptive in these templates given most of what claude says is complete nonsense. If we want concision, the reproduction steps still need to make sense.

This changes the fuzzer template to have 2 different details sections, one with a full and correct description of how to reproduce, and the other with a single command for people who know what they are doing. The maintainers do not need to look at the first section.

Testing

N/A

[codspeed-hq]

Merging this PR will improve performance by 18.36%

⚡ 2 improved benchmarks
✅ 1007 untouched benchmarks
⏩ 1515 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	bitwise_not_vortex_buffer_mut[1024]	535.6 ns	477.2 ns	+12.22%
⚡	Simulation	bitwise_not_vortex_buffer_mut[128]	376.1 ns	317.8 ns	+18.36%

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_{Comparing ct/fuzz-template-cmd (3e81753) with develop (8ac7234)}

Footnotes

1. 1515 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. ↩