Do not create or update the GitHub commit status for the whitespace job (#44160)

Author: DilumAluthge

.buildkite/pipelines/main/misc/whitespace.yml

@@ -17,8 +17,5 @@ steps:
           workspaces:
             - "/cache/repos:/cache/repos"
     timeout_in_minutes: 10
-    notify:
-      - github_commit_status:
-          context: "whitespace"
     commands: |
       make --output-sync -j$${JULIA_CPU_THREADS:?} check-whitespace