fix: ClusterSlaves result should be cut

[drivebyer]

Description
ClusterSlaves get slave info, we should parse it to get slave node id.

otherwise, the error log:

{"level":"error","ts":"2024-04-20T14:50:06+08:00","logger":"controllers.RedisCluster","msg":"Could not execute command","Command":["redis-cli","--cluster","del-node","redis-cluster-v1beta2-leader-0.redis-cluster-v1beta2-leader-headless.default.svc:6379","3acb029fead40752f432c84f9bed2e639119a573 192.168.84.239:6379@16379,redis-cluster-v1beta2-follower-5 slave e3299968586dd457a8dba04fc6c747cecd38510f 0 1713595736542 6 connected"],"Output":">>> Removing node 3acb029fead40752f432c84f9bed2e639119a573 192.168.84.239:6379@16379,redis-cluster-v1beta2-follower-5 slave e3299968586dd457a8dba04fc6c747cecd38510f 0 1713595736542 6 connected from cluster redis-cluster-v1beta2-leader-0.redis-cluster-v1beta2-leader-headless.default.svc:6379\n[ERR] No such node ID 3acb029fead40752f432c84f9bed2e639119a573 192.168.84.239:6379@16379,redis-cluster-v1beta2-follower-5 slave e3299968586dd457a8dba04fc6c747cecd38510f 0 1713595736542 6 connected\n","error":"execute command with error: command terminated with exit code 1, stderr: ","stacktrace":"github.com/OT-CONTAINER-KIT/redis-operator/k8sutils.executeCommand\n\t/Users/wuyang/workspace/github.com/drivebyer/redis-operator-1/k8sutils/redis.go:402\ngithub.com/OT-CONTAINER-KIT/redis-operator/k8sutils.RemoveRedisFollowerNodesFromCluster\n\t/Users/wuyang/workspace/github.com/drivebyer/redis-operator-1/k8sutils/cluster-scaling.go:312\ngithub.com/OT-CONTAINER-KIT/redis-operator/controllers.(*RedisClusterReconciler).Reconcile\n\t/Users/wuyang/workspace/github.com/drivebyer/redis-operator-1/controllers/rediscluster_controller.go:95\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile\n\t/Users/wuyang/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.17.2/pkg/internal/controller/controller.go:119\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler\n\t/Users/wuyang/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.17.2/pkg/internal/controller/controller.go:316\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem\n\t/Users/wuyang/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.17.2/pkg/internal/controller/controller.go:266\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2\n\t/Users/wuyang/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.17.2/pkg/internal/controller/controller.go:227"}

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• Tests have been added/modified and all tests pass.
• Functionality/bugs have been confirmed to be unchanged or fixed.
• I have performed a self-review of my own code.

Additional Context

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.51%. Comparing base (d121d86) to head (5b1c3f7).
Report is 28 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #884      +/-   ##
==========================================
+ Coverage   35.20%   39.51%   +4.31%     
==========================================
  Files          19       19              
  Lines        3213     2660     -553     
==========================================
- Hits         1131     1051      -80     
+ Misses       2015     1540     -475     
- Partials       67       69       +2     

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