enable two HTTP POST tests (#94115)

Author: wfurt

src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.RemoteServer.cs

@@ -671,14 +671,6 @@ public async Task PostAsync_Redirect_ResultingGetFormattedCorrectly(Configuratio
         [Theory, MemberData(nameof(RemoteServersMemberData))]
         public async Task PostAsync_RedirectWith307_LargePayload(Configuration.Http.RemoteServer remoteServer)
         {
-            if (remoteServer.HttpVersion == new Version(2, 0))
-            {
-                // This is occasionally timing out in CI with SocketsHttpHandler and HTTP2, particularly on Linux
-                // Likely this is just a very slow test and not a product issue, so just increasing the timeout may be the right fix.
-                // Disable until we can investigate further.
-                return;
-            }
-
             await PostAsync_Redirect_LargePayload_Helper(remoteServer, 307, true);
         }
 
@@ -722,7 +714,9 @@ private async Task PostAsync_Redirect_LargePayload_Helper(Configuration.Http.Rem
                     content.Headers.ContentMD5 = TestHelper.ComputeMD5Hash(contentBytes);
                 }
 
-                using (HttpClient client = CreateHttpClientForRemoteServer(remoteServer))
+                using HttpClient client = CreateHttpClientForRemoteServer(remoteServer);
+                client.Timeout = TimeSpan.FromMinutes(10);
+
                 using (HttpResponseMessage response = await client.PostAsync(redirectUri, content))
                 {
                     try

src/libraries/Common/tests/System/Net/Http/PostScenarioTest.cs

@@ -165,11 +165,9 @@ public async Task PostLargeContentUsingContentLengthSemantics_Success(Configurat
         [Theory, MemberData(nameof(RemoteServersMemberData))]
         public async Task PostRewindableContentUsingAuth_NoPreAuthenticate_Success(Configuration.Http.RemoteServer remoteServer)
         {
-            if (remoteServer.HttpVersion == new Version(2, 0))
+            // Sync API supported only up to HTTP/1.1
+            if (!TestAsync && remoteServer.HttpVersion.Major >= 2)
             {
-                // This is occasionally timing out in CI with SocketsHttpHandler and HTTP2, particularly on Linux
-                // Likely this is just a very slow test and not a product issue, so just increasing the timeout may be the right fix.
-                // Disable until we can investigate further.
                 return;
             }