[CI] Re-enable clang-format workflow (#15839)

It looks like this has been disabled since September(!!) due to a bad
merge
[here](9379d84#diff-6860ad0dc3584a2d702e231d5e9e9937e24f43777fd16954ce741eed68e94d50L12).

Thanks to Udit for finding this.

Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>

Author: sarnex

.github/workflows/pr-code-format.yml

@@ -7,6 +7,9 @@ on:
   pull_request:
     branches:
       - main
+      - sycl
+      - sycl-devops-pr/**
+      - sycl-rel-**
       - 'users/**'
 
 jobs: