refactor(meta): simplify InflightActorInfo and extract InflightGraphInfo

[wenym1]

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What's changed and what's your intention?

Previously, we include many inflight status of the running streaming graph in InflightActorInfo. In #17735 where we may have multiple partial graphs, we will assign a such struct to each partial graph to track their inflight statuses. Therefore, the InflightActorInfo will rename to InflightGraphInfo, and two global info fields, node_map and mv_depended_subscriptions, will be removed from the struct. The node_map will be discarded, and we will change to use the node_map stored in ActiveStreamingWorker. The mv_depended_subscriptions will be maintained separately in a newly introduced struct InflightSubscriptionInfo.

In CommandContext, we won't hold the InflightActorInfo any more. We will instead just hold its fields that we will previously access from CommandContext.

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[yezizp2012]

LGTM!