Record missing stats (#2407)

## Description:

Some stats are missing from the recorded game stats:
- Unit upgrade
- Gold from trade and from steal

The gold from trade/steal was introduced with [PR
784](https://github.com/openfrontio/OpenFrontIO/pull/784) but was
quickly reverted with [PR
927](https://github.com/openfrontio/OpenFrontIO/pull/927), probably
involuntarily.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

IngloriousTom

src/core/execution/TradeShipExecution.ts

@@ -148,6 +148,10 @@ export class TradeShipExecution implements Execution {
         this.tradeShip!.owner().id(),
         gold,
       );
+      // Record stats
+      this.mg
+        .stats()
+        .boatCapturedTrade(this.tradeShip!.owner(), this.origOwner, gold);
     } else {
       this.srcPort.owner().addGold(gold);
       this._dstPort.owner().addGold(gold, this._dstPort.tile());
@@ -163,6 +167,10 @@ export class TradeShipExecution implements Execution {
         this.srcPort.owner().id(),
         gold,
       );
+      // Record stats
+      this.mg
+        .stats()
+        .boatArriveTrade(this.srcPort.owner(), this._dstPort.owner(), gold);
     }
     return;
   }