[CI] Remove duplicate checkout step from build-and-run workflow

Author: mikepapadim

.github/workflows/build-and-run.yml

@@ -19,7 +19,6 @@ jobs:
 
     steps:
       - name: Checkout GPULlama3
-      - name: Checkout repository
         uses: actions/checkout@v4
         with:
           fetch-depth: 0