Apply std::invoke to comparator function calls

[SergeyKopienko]

This PR enhances the codebase by systematically applying std::invoke to all comparator function calls, ensuring consistent and standards-compliant invocation of comparison operations throughout the library. This change improves support for callable objects including function pointers, member function pointers, and functors.

• Wraps all direct comparator calls with std::invoke for proper callable object handling
• Adds necessary #include <functional> headers where std::invoke is used
• Updates comment documentation to reflect the new std::invoke usage

[Copilot]

Pull Request Overview

This PR enhances the codebase by systematically applying std::invoke to all comparator function calls, ensuring consistent and standards-compliant invocation of comparison operations throughout the library. This change improves support for callable objects including function pointers, member function pointers, and functors.

• Wraps all direct comparator calls with std::invoke for proper callable object handling
• Adds necessary #include <functional> headers where std::invoke is used
• Updates comment documentation to reflect the new std::invoke usage

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/support/utils.h	Added functional header for std::invoke support
test/parallel_api/algorithm/alg.sorting/alg.set.operations/set_common.h	Applied std::invoke to comparator in comp_select_first operator
test/parallel_api/algorithm/alg.nonmodifying/nth_element.pass.cpp	Applied std::invoke to comparator in lambda for nth_element test
test/general/sycl_iterator/sycl_iterator_sort.pass.cpp	Applied std::invoke to comparator in nth_element test lambda
test/general/implementation_details/balanced_path_unit_tests.pass.cpp	Applied std::invoke to comparator calls in path intersection functions
include/oneapi/dpl/pstl/utils.h	Applied std::invoke to comparator calls in iterator comparison and lower_bound functions
include/oneapi/dpl/pstl/unseq_backend_simd.h	Applied std::invoke throughout SIMD backend for min/max element operations
include/oneapi/dpl/pstl/parallel_impl.h	Added functional header and applied std::invoke in parallel find implementation
include/oneapi/dpl/pstl/parallel_backend_utils.h	Updated comment and applied std::invoke in serial merge operation
include/oneapi/dpl/pstl/parallel_backend_tbb.h	Added functional header and applied std::invoke in merge function
include/oneapi/dpl/pstl/hetero/utils_hetero.h	Applied std::invoke to comparator calls in minmax element reduce functions
include/oneapi/dpl/pstl/hetero/dpcpp/parallel_backend_sycl_merge_sort.h	Applied std::invoke in subgroup bubble sorter
include/oneapi/dpl/pstl/hetero/algorithm_impl_hetero.h	Applied std::invoke in lexicographical compare transform function
include/oneapi/dpl/pstl/algorithm_impl.h	Updated comment and applied std::invoke extensively across sorting, heap, and comparison algorithms

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