Add concurrency policy to e2e.yml workflow

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Author: Copilot

.github/workflows/e2e.yml

@@ -8,6 +8,10 @@ on:
     paths:
       - '.github/workflows/e2e.yml'
 
+concurrency:
+  group: ${{ github.workflow }}
+  cancel-in-progress: true
+
 permissions:
   contents: write
   issues: write