test(run-engine): fix flakey external deployment test

Prevents the external deployment parking test from racing with worker
setup's automatic background scheduling. The test now suppresses
helper-generated jobs and invokes the resolver only after both
deployment candidates exist.

Verified with 10 consecutive targeted test runs.

Mono-RevId: 1c2d072a208ea0eda1c47653d1346d01f0a7b9a5

Author: carderne

internal-packages/run-engine/src/engine/tests/externalDeploymentParking.test.ts

@@ -373,7 +373,9 @@ describe("RunEngine external deployment parking", () => {
     "pins to the highest deployed version holding the id, even when an older build of that id finalizes last",
     async ({ prisma, redisOptions }) => {
       const authenticatedEnvironment = await setupAuthenticatedEnvironment(prisma, "PRODUCTION");
-      const engine = createEngine(prisma, redisOptions);
+      const engine = createEngine(prisma, redisOptions, {
+        worker: { redis: redisOptions, disabled: true },
+      });
 
       try {
         const taskIdentifier = "test-task";