OpenEBS cleanup issue: `wait_for_ready()` hangs indefinitely when pod phase is `Succeeded`

[hydrogenbond007]

The wait_for_ready() method in https://github.com/microsoft/AIOpsLab/blob/main/aiopslab/service/kubectl.py#L103 does not account for the pods in terminal phases like Succeeded or Failed.
This causes timeouts when OpenEBS cleanup pods remain in the namespace.

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Benchmark failure

1. OpenEBS creates cleanup pods after PVC deletion
2. These pods enter Succeeded phase but remain in namespace
3. wait_for_ready("openebs") sees: 3 ready + 1 succeeded = 3/4 ready -> Hits the 300s timeout
4. Every subsequent problem fails at self.kubectl.wait_for_ready("openebs")

[hydrogenbond007]

I actually found this issue while running sregym SREGym/SREGym#872 which inherits a lot of the AIOpsLab problems