Always define LIBCUDACXX_ENABLE_EXPERIMENTAL_MEMORY_RESOURCE when using cudax memory resources

[miscco]

We also add a warning so that users are aware they should define LIBCUDACXX_ENABLE_EXPERIMENTAL_MEMORY_RESOURCE

[github-actions]

🟩 CI finished in 21m 28s: Pass: 100%/22 | Total: 2h 06m | Avg: 5m 43s | Max: 14m 14s | Hits: 96%/11722

• 🟩 cudax: Pass: 100%/22 | Total: 2h 06m | Avg: 5m 43s | Max: 14m 14s | Hits: 96%/11722

  🟩 cpu
    🟩 amd64              Pass: 100%/18  | Total:  1h 54m | Avg:  6m 22s | Max: 14m 14s | Hits:  96%/9406  
    🟩 arm64              Pass: 100%/4   | Total: 11m 14s | Avg:  2m 48s | Max:  2m 54s | Hits:  99%/2316  
  🟩 ctk
    🟩 12.0               Pass: 100%/1   | Total: 13m 12s | Avg: 13m 12s | Max: 13m 12s | Hits:  57%/277   
    🟩 12.5               Pass: 100%/2   | Total: 12m 22s | Avg:  6m 11s | Max:  6m 12s | Hits:  84%/742   
    🟩 12.8               Pass: 100%/19  | Total:  1h 40m | Avg:  5m 17s | Max: 14m 14s | Hits:  98%/10703 
  🟩 cudacxx
    🟩 nvcc12.0           Pass: 100%/1   | Total: 13m 12s | Avg: 13m 12s | Max: 13m 12s | Hits:  57%/277   
    🟩 nvcc12.5           Pass: 100%/2   | Total: 12m 22s | Avg:  6m 11s | Max:  6m 12s | Hits:  84%/742   
    🟩 nvcc12.8           Pass: 100%/19  | Total:  1h 40m | Avg:  5m 17s | Max: 14m 14s | Hits:  98%/10703 
  🟩 cudacxx_family
    🟩 nvcc               Pass: 100%/22  | Total:  2h 06m | Avg:  5m 43s | Max: 14m 14s | Hits:  96%/11722 
  🟩 cxx
    🟩 Clang14            Pass: 100%/1   | Total:  3m 29s | Avg:  3m 29s | Max:  3m 29s | Hits: 100%/581   
    🟩 Clang15            Pass: 100%/1   | Total:  3m 33s | Avg:  3m 33s | Max:  3m 33s | Hits: 100%/579   
    🟩 Clang16            Pass: 100%/1   | Total:  3m 30s | Avg:  3m 30s | Max:  3m 30s | Hits: 100%/579   
    🟩 Clang17            Pass: 100%/1   | Total:  3m 21s | Avg:  3m 21s | Max:  3m 21s | Hits: 100%/579   
    🟩 Clang18            Pass: 100%/4   | Total: 21m 03s | Avg:  5m 15s | Max: 11m 59s | Hits: 100%/2316  
    🟩 GCC10              Pass: 100%/1   | Total:  3m 28s | Avg:  3m 28s | Max:  3m 28s | Hits:  99%/581   
    🟩 GCC11              Pass: 100%/1   | Total:  3m 27s | Avg:  3m 27s | Max:  3m 27s | Hits:  99%/579   
    🟩 GCC12              Pass: 100%/2   | Total: 16m 05s | Avg:  8m 02s | Max: 12m 36s | Hits:  99%/1158  
    🟩 GCC13              Pass: 100%/6   | Total: 29m 22s | Avg:  4m 53s | Max: 14m 14s | Hits:  99%/3474  
    🟩 MSVC14.39          Pass: 100%/1   | Total: 13m 12s | Avg: 13m 12s | Max: 13m 12s | Hits:  57%/277   
    🟩 MSVC14.42          Pass: 100%/1   | Total: 13m 08s | Avg: 13m 08s | Max: 13m 08s | Hits:  57%/277   
    🟩 NVHPC24.7          Pass: 100%/2   | Total: 12m 22s | Avg:  6m 11s | Max:  6m 12s | Hits:  84%/742   
  🟩 cxx_family
    🟩 Clang              Pass: 100%/8   | Total: 34m 56s | Avg:  4m 22s | Max: 11m 59s | Hits: 100%/4634  
    🟩 GCC                Pass: 100%/10  | Total: 52m 22s | Avg:  5m 14s | Max: 14m 14s | Hits:  99%/5792  
    🟩 MSVC               Pass: 100%/2   | Total: 26m 20s | Avg: 13m 10s | Max: 13m 12s | Hits:  57%/554   
    🟩 NVHPC              Pass: 100%/2   | Total: 12m 22s | Avg:  6m 11s | Max:  6m 12s | Hits:  84%/742   
  🟩 gpu
    🟩 h100               Pass: 100%/2   | Total: 17m 16s | Avg:  8m 38s | Max: 14m 14s | Hits:  99%/1158  
    🟩 rtx2080            Pass: 100%/20  | Total:  1h 48m | Avg:  5m 26s | Max: 13m 12s | Hits:  96%/10564 
  🟩 jobs
    🟩 Build              Pass: 100%/19  | Total:  1h 27m | Avg:  4m 35s | Max: 13m 12s | Hits:  96%/9985  
    🟩 Test               Pass: 100%/3   | Total: 38m 49s | Avg: 12m 56s | Max: 14m 14s | Hits:  99%/1737  
  🟩 sm
    🟩 90                 Pass: 100%/3   | Total: 20m 20s | Avg:  6m 46s | Max: 14m 14s | Hits:  99%/1737  
    🟩 90a                Pass: 100%/1   | Total:  3m 17s | Avg:  3m 17s | Max:  3m 17s | Hits:  99%/579   
  🟩 std
    🟩 17                 Pass: 100%/4   | Total: 14m 53s | Avg:  3m 43s | Max:  6m 10s | Hits:  97%/2108  
    🟩 20                 Pass: 100%/18  | Total:  1h 51m | Avg:  6m 10s | Max: 14m 14s | Hits:  96%/9614  
  

👃 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: 22)

#	Runner
13	linux-amd64-cpu16
4	linux-arm64-cpu16
2	windows-amd64-cpu16
2	linux-amd64-gpu-rtx2080-latest-1
1	linux-amd64-gpu-h100-latest-1