revert: remove per-plugin pnpm build script config

The onlyBuiltDependencies config belongs in etherpad-lite core's
pnpm-workspace.yaml, not in each plugin's CI workflow. The core
repo now approves only esbuild (which needs its postinstall for
native binaries) and blocks @scarf/scarf telemetry.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: JohnMcLear

.github/workflows/backend-tests.yml

@@ -51,9 +51,6 @@ jobs:
         working-directory: ./etherpad-lite
         run: rm -rf ./src/tests/backend/specs
       -
-      - name: Configure pnpm to allow build scripts
-        working-directory: ./etherpad-lite
-        run: pnpm config --location=project set onlyBuiltDependencies '*'
         name: Install Etherpad core dependencies
         working-directory: ./etherpad-lite
         run: bin/installDeps.sh

.github/workflows/frontend-tests.yml

@@ -55,8 +55,6 @@ jobs:
         run: |
           mv ./node_modules/__tmp ./node_modules/"${PLUGIN_NAME}"
       -
-      - name: Configure pnpm to allow build scripts
-        run: pnpm config --location=project set onlyBuiltDependencies '*'
         name: Install plugin dependencies
         env:
           PLUGIN_NAME: ${{ steps.plugin_name.outputs.plugin_name }}