fix(e2e): run electron-backend-e2e targets without nested pnpm exec (#1752)

.github/workflows/ci.yml

@@ -435,6 +435,15 @@ jobs:
             - name: Check i18n drift
               run: pnpm run i18n:check
 
+            # Node specs for the benchmark and journey harness (about ten
+            # seconds). They live in the E2E app, which the unit coverage scope
+            # below treats as out of scope, so this step is not gated by it.
+            - name: Test the performance harness
+              run: pnpm nx run electron-backend-e2e:test-performance-harness --skip-nx-cache
+              env:
+                  CI: true
+                  NX_TASKS_RUNNER_DYNAMIC_OUTPUT: false
+
             # A pull request whose changes cannot reach any Tier A test (docs,
             # notes, other workflows, website, E2E and mock-server apps, release
             # and packaging tooling, a scripts-only package.json edit) skips the