Update tradeship spawn & gold meta (#3232)

## Description:

Now that pathfinding is much more efficient with hpa*, we can add more
trade ships.

This PR does the following:

1. No gold bonus for additional ports, keeps the meta simple
2. cut the gold per trade ship roughly in half.
3. Use a "pity bonus", the more times a port has failed to spawn a
tradeship, the higher the likelyhood it will spawn one
4. Increase the sigmoid so the mid-point is 200, with a half life of 50.
In tests about ~400 trade ships max.

It's pretty difficult to balance on singleplayer so I'm sure the values
will be adjusted after playtests.

## 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:

evan

src/core/configuration/Config.ts

@@ -126,11 +126,10 @@ export interface Config {
   defaultDonationAmount(sender: Player): number;
   unitInfo(type: UnitType): UnitInfo;
   tradeShipShortRangeDebuff(): number;
-  tradeShipGold(dist: number, numPorts: number): Gold;
+  tradeShipGold(dist: number): Gold;
   tradeShipSpawnRate(
+    tradeShipSpawnRejections: number,
     numTradeShips: number,
-    numPlayerPorts: number,
-    numPlayerTradeShips: number,
   ): number;
   trainGold(rel: "self" | "team" | "ally" | "other"): Gold;
   trainSpawnRate(numPlayerFactories: number): number;