build: Ignore format checks when downstreaming

Author: aqnuep

.github/workflows/vvl.yml

@@ -38,6 +38,7 @@ permissions:
 jobs:
   code-format:
     runs-on: ubuntu-24.04
+    if: '!contains(github.event.head_commit.message, "build: Downstreaming Vulkan-ValidationLayers")'
     steps:
       - uses: actions/checkout@v5
         with: