test(run-engine): keep worker queue observation test lean to avoid CI timeout

Disable the execution workers and batch consumers in the worker queue
observation test. It only needs enqueue + processMasterQueue + the observer
gauge, and the extra workers add Redis connections and make engine.quit()
hang on worker shutdown when the shard's Redis is under pressure, timing the
test out in CI.

Author: ericallam

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

@@ -45,17 +45,22 @@ describe("RunEngine worker queue observation", () => {
 
       const engine = new RunEngine({
         prisma,
+        // This test only exercises enqueue + processMasterQueue + the observer gauge, so keep
+        // the engine lean: no execution workers or batch consumers to start up and tear down.
         worker: {
           redis: redisOptions,
-          workers: 1,
-          tasksPerWorker: 10,
-          pollIntervalMs: 100,
+          disabled: true,
+          shutdownTimeoutMs: 2000,
         },
         queue: {
           redis: redisOptions,
           masterQueueConsumersDisabled: true,
           processWorkerQueueDebounceMs: 50,
         },
+        batchQueue: {
+          redis: redisOptions,
+          consumerEnabled: false,
+        },
         runLock: {
           redis: redisOptions,
         },