Replace sycl_ext_oneapi_max_work_group_query with sycl_khr_max_work_group_queries

As I understand it, Intel's `sycl_ext_oneapi_max_work_group_query extension` has been replaced by `sycl_khr_max_work_group_queries`. I don't see this change in dpc++ yet.

Are there any plans to do this?

The issue names no files, tests, or entry points. Start by locating current dpc++ references to sycl_ext_oneapi_max_work_group_query and checking how the project represents the replacement sycl_khr_max_work_group_queries extension. Done means the old extension has been replaced consistently and the affected behavior is covered.

Written by the indexing model from the issue text.