Remove PoolMemoryResource wrapper

[jcrist]

I'm seeing some OOMs in CI after the PoolMemoryResource was added. Trying removing it to see if that fixes it.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 8c06f91 and 3d93ae9.

📒 Files selected for processing (1)

• python/cuml/cuml/accel/core.py

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📝 Walkthrough

Summary by CodeRabbit

• Refactor
  • Simplified memory resource initialization by reducing intermediate resource layers for improved efficiency.

Walkthrough

Simplified memory resource configuration in CUML's acceleration core by removing an intermediate PoolMemoryResource layer from the PrefetchResourceAdaptor construction and streamlining associated type checks.

Changes

Cohort / File(s)	Summary
Memory Resource Simplification python/cuml/cuml/accel/core.py	Removed intermediate PoolMemoryResource wrapping layer; PrefetchResourceAdaptor now directly uses ManagedMemoryResource. Updated type checks to reflect the simplified resource chain structure.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly describes the main change: removing the PoolMemoryResource wrapper, which aligns with the file changes and PR objectives.
Description check	✅ Passed	The description is related to the changeset, explaining the motivation (OOM issues) for removing the PoolMemoryResource wrapper.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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[jcrist]

/merge