fix 176757 and 172434

[linchen00]

Fixes StoreKit 2 consumable purchases being reported as restored, which left transactions unfinished and blocked repeat buys.
Fixes StoreKit 2 purchase flow to send cancelled/pending/unverified results to purchaseStream.

flutter/flutter#172434
flutter/flutter#176757

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[gemini-code-assist]

Code Review

This pull request introduces two important fixes for StoreKit 2 integration. First, it correctly flags restored purchases to prevent them from being treated as new purchases, which resolves an issue with unfinished transactions for consumables. Second, it ensures that non-successful purchase outcomes, such as cancellations or pending states, are now correctly reported on the purchase stream.

My review identifies a potential high-severity issue where unverified purchases might generate duplicate events on the stream due to handling in both native and Dart code. I've also suggested a medium-severity improvement for handling an unreachable code path to enhance robustness. Overall, the changes are in the right direction to improve the reliability of StoreKit 2 purchases.