rpc: Add abortprivatebroadcast

Co-authored-by: l0rinc <pap.lorinc@gmail.com>

src/net_processing.h

@@ -12,6 +12,7 @@
 #include <private_broadcast.h>
 #include <protocol.h>
 #include <threadsafety.h>
+#include <uint256.h>
 #include <util/expected.h>
 #include <validationinterface.h>
 
@@ -122,6 +123,18 @@ public:
     /** Get info about transactions currently being privately broadcast. */
     virtual std::vector<PrivateBroadcast::TxBroadcastInfo> GetPrivateBroadcastInfo() const = 0;
 
+    /**
+     * Abort private broadcast attempts for transactions currently being privately broadcast.
+     *
+     * @param[in] id A transaction identifier. It will be matched against both txid and wtxid for
+     *               all transactions in the private broadcast queue.
+     *
+     * @return Transactions removed from the private broadcast queue. If the provided id matches a
+     *         txid that corresponds to multiple transactions with different wtxids, multiple
+     *         transactions may be returned.
+     */
+    virtual std::vector<CTransactionRef> AbortPrivateBroadcast(const uint256& id) = 0;
+
     /**
      * Initiate a transaction broadcast to eligible peers.
      * Queue the witness transaction id to `Peer::TxRelay::m_tx_inventory_to_send`