fix(synccontrols): implement proper lifecycle for XSet deletion

[AnnaYue]

修改 BatchDeleteTargetsByLabel 函数，使其遵循与 scale-in 相同的生命周期模式：

1. 触发 TargetOpsLifecycle (opslifecycle.Begin)
2. 等待操作许可 (opslifecycle.AllowOps)
3. 直接删除目标 (DeleteTarget)
4. 清理 PVC 资源

之前该函数仅添加 to-delete 标签，需要额外的控制器来处理删除。
现在直接处理删除，与 scale-in 保持一致。

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

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