chore(e2e): migrate namespace from privilegedescalation-dev to headlamp-dev (#129)

Updates E2E_NAMESPACE default to match PRI-341 provisioned namespace.

Co-authored-by: privilegedescalation-engineer[bot] <269729446+privilegedescalation-engineer[bot]@users.noreply.github.com>
Co-authored-by: Paperclip <noreply@paperclip.ing>

.github/workflows/plugin-e2e.yaml

@@ -20,7 +20,7 @@ jobs:
     timeout-minutes: 15
 
     env:
-      E2E_NAMESPACE: privilegedescalation-dev
+      E2E_NAMESPACE: headlamp-dev
       E2E_RELEASE: headlamp-e2e
       HEADLAMP_VERSION: ${{ inputs.headlamp-version }}
 
@@ -93,3 +93,4 @@ jobs:
           name: test-results
           path: test-results/
           retention-days: 7
+