[in_app_purchase] 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. First, it corrects an issue where new consumable purchases were incorrectly marked as restored by explicitly passing a flag to indicate when a transaction is part of a restore operation. Second, it ensures that non-successful purchase outcomes, such as cancellations or pending transactions, are now correctly reported to the purchaseStream. The changes in Swift and Dart seem correct and directly address the described issues. I have one suggestion regarding the CHANGELOG formatting to align with common repository practices.

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