Fix bug remaining on thrust::inclusive_scan with init value with CDP

[gonidelis]

Fixes bug remaining from #1940 in the thrust::inclusive_scan implementation with initial value that uses CDP. Also adds test, which because omitted, led to the oversight of the bug.

#2326 relies on it.

[github-actions]

🟩 CI finished in 2h 50m: Pass: 100%/251 | Total: 6d 00h | Avg: 34m 36s | Max: 1h 07m | Hits: 80%/24375

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• 🟩 pycuda: Pass: 100%/1 | Total: 10m 09s | Avg: 10m 09s | Max: 10m 09s

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👃 Inspect Changes

Modifications in project?

	Project
	CCCL Infrastructure
	libcu++
	CUB
+/-	Thrust
	CUDA Experimental
	pycuda
	CUDA C Core Library

Modifications in project or dependencies?

	Project
	CCCL Infrastructure
	libcu++
+/-	CUB
+/-	Thrust
	CUDA Experimental
+/-	pycuda
+/-	CUDA C Core Library

🏃‍ Runner counts (total jobs: 251)

#	Runner
178	linux-amd64-cpu16
42	linux-amd64-gpu-v100-latest-1
16	linux-arm64-cpu16
15	windows-amd64-cpu16