Initial dpctl tensor removal

[ethanglaser]

Description

Quick draft of potential dpctl tensor support removal, follow-up to #2721. Further discussion TBD. This would at least include:

• Updates to all GPU examples to remove dpctl tensors
• Updates to GPU/SPMD test scope to remove dpctl tensors

Other updates included that may be pushed to a later update:

• Updates to onedal datatypes and utils

Other work that may fall in similar scope:

• Increasing use of torch
• Similar updates to https://github.com/argonne-lcf/user-guides/blob/main/docs/aurora/data-science/frameworks/scikit-learn.md
• Similar updates to https://github.com/IntelPython/scikit-learn_bench

---

Checklist:

Completeness and readability

• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes or created a separate PR with updates and provided its number in the description, if necessary.
• Git commit message contains an appropriate signed-off-by string (see CONTRIBUTING.md for details).
• I have resolved any merge conflicts that might occur with the base branch.

Testing

• I have run it locally and tested the changes extensively.
• All CI jobs are green or I have provided justification why they aren't.
• I have extended testing suite if new functionality was introduced in this PR.

Performance

• I have measured performance for affected algorithms using scikit-learn_bench and provided at least a summary table with measured data, if performance change is expected.
• I have provided justification why performance and/or quality metrics have changed or why changes are not expected.
• I have extended the benchmarking suite and provided a corresponding scikit-learn_bench PR if new measurable functionality was introduced in this PR.

[ethanglaser]

/intelci: run

[david-cortes-intel]

From the CI failures, looks like calls to is_dpctl_tensor need to be removed in more places.

[ethanglaser]

/intelci: run

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
onedal/datatypes/_data_conversion.py	50.00%	0 Missing and 1 partial ⚠️
onedal/utils/_array_api.py	0.00%	0 Missing and 1 partial ⚠️

Flag	Coverage Δ
azure	80.38% <33.33%> (-0.10%)	⬇️
github	81.98% <33.33%> (-0.10%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
onedal/dummy/dummy.py	95.65% <ø> (ø)
onedal/utils/_third_party.py	88.46% <ø> (-0.43%)	⬇️
onedal/datatypes/_data_conversion.py	91.42% <50.00%> (-0.47%)	⬇️
onedal/utils/_array_api.py	90.24% <0.00%> (-0.67%)	⬇️

... and 1 file with indirect coverage changes

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