Remove FakeProfileId config and related extension method

Removed the GetFakeProfileId extension method and its class from ConfigExtensions.cs, along with the "FakeProfileId" entry from appsettings.json. Also fixed a trailing comma in appsettings.json to ensure valid JSON syntax.

src/ReC.API/Extensions/ConfigExtensions.cs

@@ -1,6 +0,0 @@
-namespace ReC.API.Extensions;
-
-public static class ConfigurationExtensions
-{
-    public static int GetFakeProfileId(this IConfiguration config) => config.GetValue("FakeProfileId", 2);
-}

src/ReC.API/appsettings.json

@@ -13,6 +13,5 @@
     // https://learn.microsoft.com/en-us/dotnet/api/system.data.sqlclient.sqlexception.number
     "BadRequestSqlExceptionNumbers": [ 515, 547, 2601, 2627, 50000 ]
   },
-  "AddedWho": "ReC.API",
-  "FakeProfileId": 2
+  "AddedWho": "ReC.API"
 }