[13.x] Make the Redis queue driver cluster-safe (bulk() node-less MULTI; allQueueNames() uses KEYS)

[Orrison]

Fixes two Redis-Cluster issues in the queue driver, both gated to phpredis cluster connections so non-cluster behavior is unchanged:

1. RedisQueue::bulk() silently drops batched jobs. On a PhpRedisClusterConnection it wraps its pushes in transaction(), which calls RedisCluster::multi() with no node. A cluster transaction must bind to one node, but the pushes route to the queue's {hash tag} slot. So exec() returns false with no exception, the jobs never enqueue, and the connection is poisoned. Bus::batch() therefore reports success and records pending_jobs, but the batch is stuck forever. Only real multi-shard clusters hit it (a single-node cluster hides it). Fix: push each job directly on the cluster branch (the pushes are independent and share one slot) the same "special-case the cluster connection" pattern the framework already uses in Cache\RedisStore::putMany(), RedisTaggedCache::flush(), and RedisBroadcaster.
2. RedisQueue::allQueueNames() uses KEYS('queues:*'), which is unavailable on managed clusters (e.g. ElastiCache Serverless) and, where available, enumerates per-node (partial on multi-shard). Fix: on a cluster connection, SCAN across all master nodes instead. (Only reached via Queue::all*Jobs(), used by QueueFake in core, latent but worth closing for cluster completeness.)

Non-cluster and Predis paths are untouched. Adds cluster + non-cluster tests for both.

[taylorotwell]

How did you run into this on your app?

[Orrison]

How did you run into this on your app?

We use an AWS Redis serverless cache and I recently adopted the https://github.com/cboxdk/laravel-queue-autoscale package to set up an auto scaling queue worker process in ECS.

So ran into this right away when setting that up, as Redis serverless is always a cluster behind a proxy. And we use queues and batches quite heavily.

I've gotten around it and am running well in production by overriding these internal classes to apply these fixes in the interim.