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wallet: track mempool conflicts with wallet transactions

Placeholder Ishaana Misra requested to merge github/fork/ishaanam/track_mempool_wallet_conflicts into master

The mempool_conflicts variable is added to CWalletTx, it is a set of txids of txs in the mempool conflicting with the wallet tx or a wallet tx's parent. This PR only changes how mempool-conflicted txs are dealt with in memory.

IsSpent now returns false for an output being spent by a mempool conflicted transaction where it previously returned true.

A txid is added to mempool_conflicts during transactionAddedToMempool. A txid is removed from mempool_conflicts during transactionRemovedFromMempool.

This PR also adds a mempoolconflicts field to the gettransaction wallet RPC result.

Builds on #27145 Second attempt at #18600

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