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 submitted transactions from being marked as dropped by ignoring confirmed incoming/transfer transactions in the duplicate nonce check, with tests and changelog updated.

• Transaction Controller:
  • Duplicate nonce logic: Update #isNonceTaken in src/helpers/PendingTransactionTracker.ts to ignore transactions where tx.type === \incoming`and any withtx.isTransferset, preventing falsedropped` events.
  • Tests: Add coverage in src/helpers/PendingTransactionTracker.test.ts to ensure no transaction-dropped event when nonce matches an incoming/transfer transaction.
• Docs:
  • Update packages/transaction-controller/CHANGELOG.md under "Fixed" to note prevention of false dropped status for nonce collisions with incoming transactions.

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