Split local and remote E2E tests

[isaacroldan]

Why

Shopify authentication failures currently block local E2E checks that do not use remote services.

What

• Add separate local, remote-auth, and remote Playwright projects.
• Store shared authentication artifacts at stable paths for remote workers.
• Run the four local smoke and fixture tests in a separate CI job without Shopify secrets.
• Limit the existing sharded jobs to the remote project.

Testing

• pnpm --filter @shopify/e2e lint
• pnpm --filter @shopify/e2e type-check
• Local Playwright project: 4 tests passed without Shopify credentials
• Both remote shard test lists include the remote authentication setup
• Workflow YAML parsing and git diff --check passed