Remove all E2E infrastructure — approach is dead

Delete the entire local E2E testing setup:
- e2e/ directory (Playwright tests)
- scripts/deploy-e2e-headlamp.sh and teardown-e2e-headlamp.sh
- .github/workflows/e2e.yaml
- playwright.config.ts
- E2E npm scripts and @playwright/test dependency
- E2E-related .gitignore entries

RBAC is managed by Flux GitOps in privilegedescalation/infra.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

scripts/teardown-e2e-headlamp.sh

@@ -1,38 +0,0 @@
-#!/usr/bin/env bash
-# teardown-e2e-headlamp.sh
-#
-# Tears down the dedicated E2E Headlamp instance deployed by deploy-e2e-headlamp.sh.
-#
-# Environment:
-#   E2E_NAMESPACE  — namespace to clean up (default: headlamp-dev)
-#   E2E_RELEASE    — release/resource name prefix (default: headlamp-e2e)
-set -euo pipefail
-
-REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
-
-E2E_NAMESPACE="${E2E_NAMESPACE:-headlamp-dev}"
-E2E_RELEASE="${E2E_RELEASE:-headlamp-e2e}"
-
-echo "=== E2E Headlamp Teardown ==="
-echo "  Namespace: $E2E_NAMESPACE"
-echo "  Release:   $E2E_RELEASE"
-
-echo "Removing Headlamp Deployment, Service, and ServiceAccount..."
-kubectl delete deployment "${E2E_RELEASE}" -n "$E2E_NAMESPACE" --ignore-not-found
-kubectl delete service "${E2E_RELEASE}" -n "$E2E_NAMESPACE" --ignore-not-found
-kubectl delete serviceaccount "${E2E_RELEASE}" -n "$E2E_NAMESPACE" --ignore-not-found
-
-echo "Cleaning up ConfigMap..."
-kubectl delete configmap headlamp-intel-gpu-plugin -n "$E2E_NAMESPACE" --ignore-not-found
-
-echo "Cleaning up test service account..."
-kubectl delete serviceaccount headlamp-e2e-test -n "$E2E_NAMESPACE" --ignore-not-found
-
-# Clean up .env.e2e if present
-if [ -f "$REPO_ROOT/.env.e2e" ]; then
-  rm "$REPO_ROOT/.env.e2e"
-  echo "Removed .env.e2e"
-fi
-
-echo ""
-echo "E2E teardown complete."