Revert "chore(e2e): Stop running current builds with new pushes (#6309)" (#6332)

This reverts commit 11fc97622f.

.github/workflows/build.yml

@@ -11,10 +11,6 @@ on:
   workflow_call:
   workflow_dispatch:
 
-concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
-  cancel-in-progress: true
-
 env:
   PKG_NAME: "boundary"