fix(ci): use correct env name for pnpm packageManager strict bypass

The previous env var \`PNPM_PACKAGE_MANAGER_STRICT\` is not recognized
by pnpm, so pnpm kept refusing the pack step with
\`This project is configured to use utoo\`. The actual setting is
\`package-manager-strict\`, exposed via \`NPM_CONFIG_PACKAGE_MANAGER_STRICT\`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: killagu

.github/workflows/e2e-test.yml

@@ -175,7 +175,7 @@ jobs:
         # run when `packageManager` points at another tool, so disable
         # that strict check for just this step.
         env:
-          PNPM_PACKAGE_MANAGER_STRICT: 'false'
+          NPM_CONFIG_PACKAGE_MANAGER_STRICT: 'false'
         run: pnpm -r pack
 
       - name: Override dependencies from tgz in ${{ matrix.project.name }}