Add sycl_ext_oneapi_profiling_tag to the supported extensions list

The [sycl_ext_oneapi_profiling_tag](https://github.com/intel/llvm/blob/sycl/sycl/doc/extensions/experimental/sycl_ext_oneapi_profiling_tag.asciidoc) is currently experimental extension while actual products such as Pytorch rely on it in the shipped products. Can this extension be promoted from experimental to supported?

See: https://github.com/pytorch/pytorch/blob/v2.13.0/c10/xpu/XPUEvent.h#L160
CC: @gmlueck, @EikanWang, @guangyey

Start by reading the linked sycl_ext_oneapi_profiling_tag specification and the PyTorch XPUEvent.h usage to understand the extension's current status and consumers. Locate the project's supported-extensions list and update it so this extension is consistently marked supported, then verify the documentation and any existing extension checks remain consistent.

Written by the indexing model from the issue text.