Disable some failing/hanging HTTP tests (#28425)

Opened some issues #28423 #28424. These tests are failing/hanging on my
dev box all the time.

Author: davidsh

src/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.ResponseDrain.cs

@@ -208,6 +208,12 @@ public async Task GetAsyncLargeRequestWithMaxConnections_DisposeBeforeReadingToE
         [InlineData(4000000, 1000000, ContentMode.BytePerChunk)]
         public async Task GetAsyncWithMaxConnections_DisposeBeforeReadingToEnd_KillsConnection(int totalSize, int readSize, ContentMode mode)
         {
+            if (IsWinHttpHandler)
+            {
+                // [ActiveIssue(28424)]
+                return;
+            }
+
             await LoopbackServer.CreateClientAndServerAsync(
                 async url =>
                 {

src/System.Net.Http/tests/FunctionalTests/HttpProtocolTests.cs

@@ -546,6 +546,12 @@ public static IEnumerable<object> GetAsync_Chunked_VaryingSizeChunks_ReceivedCor
         [MemberData(nameof(GetAsync_Chunked_VaryingSizeChunks_ReceivedCorrectly_MemberData))]
         public async Task GetAsync_Chunked_VaryingSizeChunks_ReceivedCorrectly(int maxChunkSize, string lineEnding, bool useCopyToAsync)
         {
+            if (IsWinHttpHandler)
+            {
+                // [ActiveIssue(28423)]
+                return;
+            }
+
             if (!UseSocketsHttpHandler && lineEnding != "\r\n")
             {
                 // Some handlers don't deal well with "\n" alone as the line ending