fix #2567 - migrate tenant connection string details from database to appsettings.json

Oqtane.Server/Repository/Context/DBContextDependencies.cs

@@ -0,0 +1,20 @@
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Configuration;
+using Oqtane.Infrastructure;
+
+namespace Oqtane.Repository
+{
+    public class DBContextDependencies : IDBContextDependencies
+    {
+        public DBContextDependencies(ITenantManager tenantManager, IHttpContextAccessor httpContextAccessor, IConfigurationRoot config)
+        {
+            TenantManager = tenantManager;
+            Accessor = httpContextAccessor;
+            Config = config;
+        }
+
+        public ITenantManager TenantManager { get; }
+        public IHttpContextAccessor Accessor { get; }
+        public IConfigurationRoot Config { get; }
+    }
+}