Update oneDAL DPC interface detection

[Alexsandruss]

Description

Update the way how sklearnex building script decides to enable DPC part:

• Check for existence of onedal_dpc shared library
• Check if NO_DPC env variable is not set

Solves #1981

---

Checklist to comply with before moving PR from draft:

PR completeness and readability

• I have reviewed my changes thoroughly before submitting this pull request.
• 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 update 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 added a respective label(s) to PR if I have a permission for that.
• I have resolved any merge conflicts that might occur with the base branch.

Testing

• The unit tests pass successfully.
• I have run it locally and tested the changes extensively.

Performance

• I have measured performance for affected algorithms using scikit-learn_bench and provided at least summary table with measured data, if performance change is expected.
• I have provided justification why performance has changed or why changes are not expected.

[Alexsandruss]

/intelci: run

[Alexsandruss]

/intelci: run

[Alexsandruss]

/intelci: run

[Alexsandruss]

/intelci: run

[Alexsandruss]

/intelci: run

[samir-nasibli]

I am ok with proposed changes, but it seems we are not testing the case, when NO_DPC is enabled.