Fix XSD schemaLocation when UrlOverride is specified

[zgabi]

sWe have a webservice in the following address: https://pannonris.hu/web/PannonRisIf3Ws?import&name=ServiceDefinitions.xml
The application server hosts the service in the /DataExcahngeService location, but in the public service it is overwritten to web/PannonRisIf3Ws

In the url above the schemaLocation is wrong since the overwrite is not applied sometimes:

Another small issue is also fixed... with newer .NET (10) I get a warning, that in the HeaderHelper comparing soapAction to null is redundant, since it is a Span, it wont be null.

[zgabi]

Test fixed.

I think the test was wrong, since in another test you can see that the service is located at /Management/Service.asmx

SoapCore/src/SoapCore.Tests/WsdlFromFile/WsdlIncludeTests.cs

Lines 51 to 74 in 04b30d4

	public void CheckXSDInclude()
	{
	StartService(typeof(EchoIncludeService));
	var wsdl = GetWsdlFromAsmx("Service.asmx");
	StopServer();
	var root = new XmlDocument();
	root.LoadXml(wsdl);
	var nsmgr = new XmlNamespaceManager(root.NameTable);
	nsmgr.AddNamespace("wsdl", "http://schemas.xmlsoap.org/wsdl/");
	nsmgr.AddNamespace("xs", "http://www.w3.org/2001/XMLSchema");
	nsmgr.AddNamespace("soapbind", "http://schemas.xmlsoap.org/wsdl/soap/");
	var element = root.SelectSingleNode("/wsdl:definitions/wsdl:types/xs:schema/xs:include[1]", nsmgr);
	var addresses = _host.ServerFeatures.Get<IServerAddressesFeature>();
	var address = addresses.Addresses.Single();
	string url = address + "/Management/Service.asmx?xsd&name=echoInclude.xsd";
	Assert.IsNotNull(element);
	Assert.AreEqual(url, element.Attributes["schemaLocation"]?.Value);
	}

But in the CheckXSDIncludeXSD test the Management folder was missing:

SoapCore/src/SoapCore.Tests/WsdlFromFile/WsdlIncludeTests.cs

Line 113 in 04b30d4

string url = address + "/Service.asmx?xsd&name=echoIncluded.xsd";