Updated kuberentes pod operator to find pods only in running state

[paramjeet01]

The proposed changes to the find_pod method will ensure it selects only pods that are in the running state, effectively ignoring pods that are in the terminating state. This adjustment addresses the issue of pods remaining in the terminating state for an extended period.

closes: https://github.com/apache/airflow/issues/39096 related: https://github.com/apache/airflow/issues/39096

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