[wasm] Enable System.Net.WebSockets.Tests.WebSocketTests class

[MaximLipnin]

At the moment System.Net.WebSockets.Tests crashes with:

  dbug: test[0]
        ABORT: Assertion failed: undefined
  dbug: test[0]
        Stacktrace: 
  dbug: test[0]
  dbug: test[0]
        Error
  dbug: test[0]
            at Object.onAbort (runtime.js:160:13)
  dbug: test[0]
            at abort (dotnet.js:1:14661)
  dbug: test[0]
            at assert (dotnet.js:1:7330)
  dbug: test[0]
            at Object.createSocket (dotnet.js:1:83832)
  dbug: test[0]
            at ___sys_socketcall (dotnet.js:1:98804)
  dbug: test[0]
            at socket (<anonymous>:wasm-function[1040]:0x215eb)
  dbug: test[0]
            at SystemNative_Socket (<anonymous>:wasm-function[5651]:0xf3837)
  dbug: test[0]
            at do_icall (<anonymous>:wasm-function[5389]:0xe858b)
  dbug: test[0]
            at do_icall_wrapper (<anonymous>:wasm-function[1703]:0x48356)
  dbug: test[0]
            at interp_exec_method (<anonymous>:wasm-function[1224]:0x29de8)
  dbug: test[0]
            at interp_runtime_invoke (<anonymous>:wasm-function[4964]:0xcf318)
  dbug: test[0]
            at mono_jit_runtime_invoke (<anonymous>:wasm-function[4467]:0xb917c)
  dbug: test[0]
            at do_runtime_invoke (<anonymous>:wasm-function[1702]:0x4829f)
  dbug: test[0]
            at mono_runtime_invoke_checked (<anonymous>:wasm-function[346]:0xac01)
  dbug: test[0]
            at mono_runtime_try_invoke_array (<anonymous>:wasm-function[4225]:0xae4b0)
  dbug: test[0]
            at ves_icall_InternalInvoke (<anonymous>:wasm-function[3525]:0x95710)
  dbug: test[0]
            at ves_icall_InternalInvoke_raw (<anonymous>:wasm-function[3524]:0x951d9)
  dbug: test[0]
            at do_icall (<anonymous>:wasm-function[5389]:0xe858b)
  dbug: test[0]
            at do_icall_wrapper (<anonymous>:wasm-function[1703]:0x48356)
  dbug: test[0]
            at interp_exec_method (<anonymous>:wasm-function[1224]:0x29de8)
  dbug: test[0]
            at interp_runtime_invoke (<anonymous>:wasm-function[4964]:0xcf318)
  dbug: test[0]
            at mono_jit_runtime_invoke (<anonymous>:wasm-function[4467]:0xb917c)
  dbug: test[0]
            at do_runtime_invoke (<anonymous>:wasm-function[1702]:0x4829f)
  dbug: test[0]
            at mono_runtime_try_invoke (<anonymous>:wasm-function[425]:0xd5a5)
  dbug: test[0]
            at mono_runtime_invoke (<anonymous>:wasm-function[4230]:0xae815)
  dbug: test[0]
            at mono_wasm_invoke_method (<anonymous>:wasm-function[4036]:0xa8bea)
  dbug: test[0]
            at Module._mono_wasm_invoke_method (dotnet.js:1:187283)
  dbug: test[0]
            at Object.init (runtime.js:366:15)
  dbug: test[0]
            at runtime.js:245:9
  dbug: test[0]
            at dotnet.js:1:128739

@vargaz made some fix for that emscripten-core/emscripten#11482. Among others, it should be included to the emscripten release version which we could bump in dotnet/runtime. So the respective tests could be enabled.

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