[CI] Remove Nightly build configuration for opaque pointers (#10723)

This mode is tested by the default configuration now.

Author: bader

.github/workflows/sycl_nightly.yml

@@ -31,18 +31,6 @@ jobs:
       # prefer widespread gzip compression.
       artifact_archive_name: sycl_linux.tar.gz
 
-  ubuntu2204_opaque_pointers_build_test:
-    if: github.repository == 'intel/llvm'
-    uses: ./.github/workflows/sycl_linux_build_and_test.yml
-    needs: test_matrix
-    secrets: inherit
-    with:
-      build_cache_root: "/__w/"
-      build_cache_suffix: opaque_pointers
-      build_artifact_suffix: opaque_pointers
-      build_configure_extra_args: "--hip --cuda --enable-esimd-emulator --cmake-opt=-DSPIRV_ENABLE_OPAQUE_POINTERS=TRUE"
-      merge_ref: ''
-
   windows_default:
     name: Windows
     if: github.repository == 'intel/llvm'