fix(smoketests): raise devbox snapshot test timeouts to 120s

The two tests in the `devbox snapshots` suite hard-coded a 30s per-test
timeout, overriding the 300s smoketest default in jest.config.ts. Under
concurrent CI load, devbox create+snapshot tail latency exceeds 30s
(measured up to ~22s at 30-way parallelism), causing flaky timeouts.
Raise both to 120s for headroom while still failing fast on a genuine hang.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: Reflex

tests/smoketests/snapshots.test.ts

@@ -29,7 +29,7 @@ describe('smoketest: devbox snapshots', () => {
         await client.devboxes.shutdown(devbox.id);
       }
     }
-  }, 30_000);
+  }, 120_000);
 
   test('launch devbox from snapshot (deprecated polling path)', async () => {
     const warnSpy = jest.spyOn(console, 'warn').mockImplementation((...args: unknown[]) => {
@@ -54,5 +54,5 @@ describe('smoketest: devbox snapshots', () => {
         await client.devboxes.shutdown(devbox.id);
       }
     }
-  }, 30_000);
+  }, 120_000);
 });