New transport tests api

Author: andreasohlund

src/NServiceBus.Transport.PostgreSql.TransportTests/TransportTestsConfiguration.cs

@@ -0,0 +1,6 @@
+namespace NServiceBus.TransportTests;
+
+public partial class TransportTestsConfiguration
+{
+    public IConfigureTransportInfrastructure CreateTransportConfiguration() => new ConfigurePostgreSqlTransportInfrastructure();
+}

src/NServiceBus.Transport.SqlServer.TransportTests/TransportTestsConfiguration.cs

@@ -0,0 +1,6 @@
+namespace NServiceBus.TransportTests;
+
+public partial class TransportTestsConfiguration
+{
+    public IConfigureTransportInfrastructure CreateTransportConfiguration() => new ConfigureSqlServerTransportInfrastructure();
+}