fix(auth-validator): [PM-22975] Client Version Validator - misc changes, trying to get things to work

test/IntegrationTestCommon/Factories/WebApplicationFactoryExtensions.cs

@@ -23,6 +23,9 @@ public static class WebApplicationFactoryExtensions
             // it runs after this so it will take precedence.
             httpContext.Connection.RemoteIpAddress = IPAddress.Parse(FactoryConstants.WhitelistedIp);
 
+            // Ensure response body is bufferable and seekable for tests to read later
+            httpContext.Response.Body = new MemoryStream();
+
             httpContext.Request.Path = new PathString(requestUri);
             httpContext.Request.Method = method.Method;