When standby transitions to active, the component state changes to
Initialize. If the initialization takes too long (exceeding the liveness
probe's maximum retries), the standby pod is stopped and fails to start.
This PR removes the Initialize state during standby transitions in
rolling upgrades. The state now switches directly from standby to
healthy, preventing health check failures.
issue: https://github.com/milvus-io/milvus/issues/37630
pr: https://github.com/milvus-io/milvus/pull/38308
Signed-off-by: bigsheeper <yihao.dai@zilliz.com>
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