[CI] Switch post-commit jobs to self-hosted runners (#5147)

Should not be a problem with the increased machine count

Author: Alexander Batashev

.github/workflows/sycl_post_commit.yml

@@ -9,13 +9,15 @@ jobs:
     name: Linux Default
     uses: intel/llvm/.github/workflows/sycl_linux_build_and_test.yml@sycl
     with:
+      build_runs_on: build
       build_cache_root: "/__w/llvm"
       build_github_cache: true
-      build_artifact_suffix: build
+      build_artifact_suffix: default
   linux_no_assert:
     name: Linux (no assert)
     uses: intel/llvm/.github/workflows/sycl_linux_build_and_test.yml@sycl
     with:
+      build_runs_on: build
       build_cache_root: "/__w/llvm"
       build_github_cache: true
       build_cache_suffix: gcc_no_assertions