removals: DAAL_C11_OVERRIDE

[Alexandr-Solovev]

Description

This PR removes the DAAL_C11_OVERRIDE macro and replaces its usages with the standard C++ override keyword.

The macro was previously used as a compatibility wrapper for older compilers.

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.

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[david-cortes-intel]

/intelci: run

[ethanglaser]

Created a similar branch in sklearnex which appears to help with the linux CI but there are still issues on windows: http://intel-ci.intel.com/f102e86d-e63e-f1bb-bf2e-a4bf010d0e2d

[david-cortes-intel]

Looks like something went wrong in the CI:

WARNING - Unable to find /localdisk2/mkl/mkltest/ec/oneDAL-CI-dev_asolovev_daal_override_removals-723603-20260205092108/build/onedal_linux_icx/__release_lnx/daal4py-3.10 for component lnx_sklearnex_3.10