feat(ci): add StackBlitz templates for e2e apps on PR previews

Adds --template flag to pkg-pr-new so PR comments include
interactive StackBlitz links for all e2e apps. Also switches
to --pnpm for correct packing in the monorepo.

Author: ryanbas21

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
       - name: Ensure builds run
         run: pnpm nx run-many -t build --no-agents
 
-      - run: pnpm pkg-pr-new publish './packages/*' './packages/sdk-effects/*' --pnpm --packageManager=pnpm
+      - run: pnpm pkg-pr-new publish './packages/*' './packages/sdk-effects/*' --template './e2e/*-app' --pnpm --packageManager=pnpm
 
       - name: build docs
         run: pnpm generate-docs