feat: use pnpm pack for e2e (#490)

.changeset/lemon-rice-repeat.md

.github/workflows/e2e.yml

packages/create-llama/create-app.ts

packages/create-llama/e2e/utils.ts

packages/create-llama/helpers/dir.ts

packages/create-llama/helpers/index.ts

packages/create-llama/helpers/llama-pack.ts

packages/create-llama/helpers/python.ts

packages/create-llama/helpers/typescript.ts

packages/create-llama/package.json