Add JSON HMR regression test for #91768
Tests that Turbopack HMR correctly propagates consecutive JSON file edits
across three scenarios: server component with static import, client component
with static import, and server component with dynamic import() using template
literals. Each test patches the JSON file multiple times to catch the regression
where only the first edit triggers HMR.
Co-Authored-By: Claude <noreply@anthropic.com>
