[SYCL] Deprecate group::get_global_range() (#7032)

This patch deprecates group::get_global_range() as it was removed from
SYCL 2020

Author: dm-vodopyanov

sycl/include/sycl/group.hpp

@@ -115,6 +115,8 @@ template <int Dimensions = 1> class __SYCL_TYPE(group) group {
 
   size_t get_group_id(int dimension) const { return index[dimension]; }
 
+  __SYCL2020_DEPRECATED("calculate sycl::group::get_group_range() * "
+                        "sycl::group::get_max_local_range() instead")
   range<Dimensions> get_global_range() const { return globalRange; }
 
   size_t get_global_range(int dimension) const {