MAINT: Stronger check for dpctl availability

[david-cortes-intel]

Description

Makes a stronger check for availability of DPCTL, by trying to import the queue class from it. Should make it throw more informative errors in cases in which dpctl is installed but somehow not working, or in which there is a local folder named 'dpctl' in the workspace.

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Checklist:

Completeness and readability

• 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.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
azure	79.65% <100.00%> (+0.02%)	⬆️
github	81.96% <100.00%> (-0.01%)	⬇️

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Files with missing lines	Coverage Δ
onedal/utils/_third_party.py	90.90% <100.00%> (+2.44%)	⬆️

... and 1 file with indirect coverage changes

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[icfaust]

with the dpctl tensor removal #3091, the function is_dpctl_available is now only used here, with the result used in in test fixtures. I think this warrants a rewrite at line 64 to a try catch statement which will more elegantly solve what is required here. And then possibly moving this as a test fixture (conftest.py perhaps?). This will improve maintainability and clarity. @david-cortes-intel @avolkov-intel @ethanglaser

[david-cortes-intel]

with the dpctl tensor removal #3091, the function is_dpctl_available is now only used here, with the result used in in test fixtures. I think this warrants a rewrite at line 64 to a try catch statement which will more elegantly solve what is required here. And then possibly moving this as a test fixture (conftest.py perhaps?). This will improve maintainability and clarity. @david-cortes-intel @avolkov-intel @ethanglaser

Removed the function.

[david-cortes-intel]

/intelci: run