Fix up exceptions for HTTP2 tests

Author: captainsafia

src/Servers/Kestrel/test/Interop.FunctionalTests/HttpClientHttp2InteropTests.cs

@@ -739,7 +739,7 @@ public async Task ServerReset_BeforeRequestBody_ClientBodyThrows(string scheme)
             await serverReset.Task.DefaultTimeout();
             var responseEx = await Assert.ThrowsAsync<HttpRequestException>(() => response.Content.ReadAsStringAsync().DefaultTimeout());
             Assert.Contains("The HTTP/2 server reset the stream. HTTP/2 error code 'CANCEL' (0x8)", responseEx.ToString());
-            await Assert.ThrowsAsync<TaskCanceledException>(() => streamingContent.SendAsync("Hello World").DefaultTimeout());
+            await Assert.ThrowsAsync<IOException>(() => streamingContent.SendAsync("Hello World").DefaultTimeout());
             await Assert.ThrowsAnyAsync<OperationCanceledException>(() => clientEcho.Task.DefaultTimeout());
 
             await host.StopAsync().DefaultTimeout();
@@ -932,7 +932,7 @@ public async Task ClientReset_BeforeResponse_ResponseSuppressed(string scheme)
             await requestReceived.Task.DefaultTimeout();
             requestCancellation.Cancel();
             await serverResult.Task.DefaultTimeout();
-            await Assert.ThrowsAsync<IOException>(() => requestTask).DefaultTimeout();
+            await Assert.ThrowsAsync<TaskCanceledException>(() => requestTask).DefaultTimeout();
 
             await host.StopAsync().DefaultTimeout();
         }