Set CI concurrency at the job level (#23689)

.github/workflows/build-image.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
 
     concurrency:
-      group: ${{ github.ref }}
+      group: ${{ github.workflow }}-${{ github.ref }}
       cancel-in-progress: true
 
     steps:

.github/workflows/rebase-needed.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     concurrency:
-      group: ${{ github.ref }}
+      group: ${{ github.workflow }}-${{ github.ref }}
       cancel-in-progress: true
 
     steps: