assorted bug fixes for the std::execution implementation in cudax

[ericniebler]

Description

assorted fixes for ustdex issues i found while prototyping the cudax async model. this PR fixes:

• missing deduction guides for prop and __rcvr_with_env_t
• bad diagnostics from sync_wait for senders that fail type-checking
• lack of sync_wait overload that takes an environment
• __decay_copy isn't decaying lvalues
• needless duplication of cuda::std::__ignore_t
• reversed args when constructing the operation state of write_env

[github-actions]

🟩 CI finished in 19m 04s: Pass: 100%/20 | Total: 2h 06m | Avg: 6m 20s | Max: 12m 45s | Hits: 85%/10080

• 🟩 cudax: Pass: 100%/20 | Total: 2h 06m | Avg: 6m 20s | Max: 12m 45s | Hits: 85%/10080

  🟩 cpu
    🟩 amd64              Pass: 100%/16  | Total:  1h 50m | Avg:  6m 54s | Max: 12m 45s | Hits:  85%/7868  
    🟩 arm64              Pass: 100%/4   | Total: 16m 12s | Avg:  4m 03s | Max:  4m 14s | Hits:  87%/2212  
  🟩 ctk
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  🟩 cudacxx
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  🟩 cudacxx_family
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  🟩 cxx
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    🟩 GCC10              Pass: 100%/1   | Total:  4m 29s | Avg:  4m 29s | Max:  4m 29s | Hits:  87%/555   
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    🟩 NVHPC24.7          Pass: 100%/2   | Total: 17m 15s | Avg:  8m 37s | Max:  8m 45s | Hits:  60%/706   
  🟩 cxx_family
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    🟩 GCC                Pass: 100%/8   | Total: 43m 09s | Avg:  5m 23s | Max: 12m 45s | Hits:  89%/4426  
    🟩 MSVC               Pass: 100%/2   | Total: 22m 32s | Avg: 11m 16s | Max: 11m 27s | Hits:  58%/522   
    🟩 NVHPC              Pass: 100%/2   | Total: 17m 15s | Avg:  8m 37s | Max:  8m 45s | Hits:  60%/706   
  🟩 gpu
    🟩 rtx2080            Pass: 100%/20  | Total:  2h 06m | Avg:  6m 20s | Max: 12m 45s | Hits:  85%/10080 
  🟩 jobs
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  🟩 std
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    🟩 20                 Pass: 100%/16  | Total:  1h 46m | Avg:  6m 40s | Max: 12m 45s | Hits:  86%/8068  
  

👃 Inspect Changes

Modifications in project?

	Project
	CCCL Infrastructure
	libcu++
	CUB
	Thrust
+/-	CUDA Experimental
	python
	CCCL C Parallel Library
	Catch2Helper

Modifications in project or dependencies?

	Project
	CCCL Infrastructure
	libcu++
	CUB
	Thrust
+/-	CUDA Experimental
	python
	CCCL C Parallel Library
	Catch2Helper

🏃‍ Runner counts (total jobs: 20)

#	Runner
12	linux-amd64-cpu16
4	linux-arm64-cpu16
2	windows-amd64-cpu16
2	linux-amd64-gpu-rtx2080-latest-1