Fix async ClusterPipeline missing nodes_manager and set_response_callback required by JSON module

[petyaslavova]

Summary

Fixes #3936 where calling .json() on an async ClusterPipeline raised AttributeError: 'ClusterPipeline' object has no attribute 'nodes_manager'.

Problem

The Redis JSON module requires access to nodes_manager (for protocol version checking) and set_response_callback (for registering command decoders) during initialization. The async ClusterPipeline uses a composition pattern—holding a reference to cluster_client rather than inheriting from RedisCluster like the sync implementation—so these members weren't automatically available.

Solution

• Added nodes_manager property that delegates to self.cluster_client.nodes_manager
• Added set_response_callback() method that delegates to self.cluster_client.set_response_callback()

Testing

• Unit tests verify the property and method correctly delegate to the cluster client
• Test confirms pipeline.json() can now be called without errors on both standalone and cluster pipelines

Notes

The sync ClusterPipeline is not affected since it inherits directly from RedisCluster.

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Note

Low Risk
Low risk: adds simple delegation accessors on ClusterPipeline and corresponding tests, mainly to unblock pipeline.json() without changing command execution behavior.

Overview
Fixes an AttributeError when calling pipeline.json() on async cluster pipelines by exposing ClusterPipeline.nodes_manager and ClusterPipeline.set_response_callback() as delegations to the underlying RedisCluster client.

Adds async tests verifying these delegations and that pipeline.json() initializes successfully and registers JSON.* response callbacks on the cluster client.

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[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

[Copilot]

Pull request overview

Fixes an async Redis Cluster pipeline compatibility gap needed by the RedisJSON module, where calling pipeline.json() on redis.asyncio.cluster.ClusterPipeline raised AttributeError due to missing nodes_manager and set_response_callback.

Changes:

• Add ClusterPipeline.nodes_manager property delegating to the underlying RedisCluster client.
• Add ClusterPipeline.set_response_callback() delegating to the underlying RedisCluster client.
• Add async tests covering the delegation behavior and ensuring pipeline.json() initializes successfully (standalone + cluster).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
redis/asyncio/cluster.py	Exposes nodes_manager + set_response_callback on async ClusterPipeline via delegation to the composed cluster client.
tests/test_asyncio/test_cluster.py	Adds unit tests asserting the new delegation property/method behave as expected for cluster pipelines.
tests/test_asyncio/test_pipeline.py	Adds a regression test verifying pipeline.json() no longer raises and registers JSON response callbacks.

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