Remove flaky markers for standalone_2/io tests, MacOS upgrade seemed …

…to have getten rid underlying OS issue

Closes dart-lang/sdk#34760

Change-Id: Iec6c14a15ff719fb6e790ecf24a44f2d153fe271
Reviewed-on: https://dart-review.googlesource.com/c/81241
Auto-Submit: Martin Kustermann <kustermann@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Commit-Queue: Vyacheslav Egorov <vegorov@google.com>

tests/standalone_2/standalone_2_kernel.status

@@ -157,18 +157,6 @@ io/socket_port_test: Pass, Crash
 [ $mode == debug && $hot_reload && ($compiler == dartk || $compiler == dartkb) ]
 io/web_socket_ping_test: Crash, Pass
 
-[ $system == macos ]
-io/http_requested_uri_test: Pass, Timeout # Issue 34760
-io/http_response_deadline_test: Pass, Timeout # Issue 34760
-io/https_server_test: Pass, Timeout # Issue 34760
-io/raw_secure_server_closing_test: Pass, Timeout # Issue 34760
-io/secure_server_socket_test: Pass, Timeout # Issue 34760
-io/secure_unauthorized_test: Pass, Timeout # Issue 34760
-io/socket_source_address_test: Pass, Timeout # Issue 34760
-io/web_socket_compression_test: Pass, Timeout # Issue 34760
-io/web_socket_test: Pass, Timeout, RuntimeError # Issue 34760
-io/secure_server_closing_test: Pass, Timeout, RuntimeError # Issue 34760
-
 [ $runtime == vm && $strong && ($compiler == dartk || $compiler == dartkb) ]
 io/http_client_request_test: Pass, Timeout
 io/http_compression_test: RuntimeError