fix: ignore incoming transactions in duplicate nonce check

[matthewwalsh0]

Explanation

Ignore transactions with isTransfer set when checking for duplicate nonces in PendingTransactionTracker.

References

Related to #6135

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

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Note

Prevents pending transactions from being marked dropped when their nonce matches an incoming/transfer transaction by refining the nonce-taken check.

• PendingTransactionTracker:
  • Refine #isNonceTaken to exclude transactions where tx.type !== incoming AND tx.isTransfer !== undefined, avoiding false duplicate-nonce drops from incoming/transfer transactions.
  • Add unit test ensuring no transaction-dropped event when a matching nonce belongs to an incoming transaction.
• Changelog:
  • Document fix: prevent transactions marked as dropped if nonce matches incoming transaction.

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