[wasi] Disable failing tests to get CI green (#85681)
* [wasi] Disable failing tests in System.Runtime.Serialization.Xml.Tests
Issue: https://github.com/dotnet/runtime/issues/82967, and https://github.com/dotnet/runtime/issues/73961
* [wasi] Disable failing test
System.Runtime.Serialization.Xml.ReflectionOnly.Tests:DataContractSerializerTests.DCS_MemoryStream_Deserialize_CompatibleWithFullFramework
Issue: https://github.com/dotnet/runtime/issues/73961
* [wasi] Disable tests failing depending on tmp fs
System.Runtime.Serialization.Xml.ReflectionOnly.Tests, and System.Runtime.Serialization.Xml.Tests
Test: DataContractSerializerTests.DCS_FileStreamSurrogate
Issue: https://github.com/dotnet/runtime/issues/85690