Exclude ToF tests using System.IO.FileSystem.Tests!ManageFileSystem from stress runs

[Scott Schaab]

This class does cleanup in it's finalizer which throws an exception. Because this is on the finalizer it cannot be handled and tears down the stress mix. These tests need to be identified and excluded from generated stress mixes.

libc.so.6!gsignal
libc.so.6!abort
libcoreclr.so!PROCEndProcess
libcoreclr.so!UnwindManagedExceptionPass1
libcoreclr.so!DispatchManagedException
libcoreclr.so!IL_Throw
System.IO.FileSystem!System.IO.DirectoryInfo..ctor
System.IO.FileSystem.Tests!FailSafeDirectoryOperations.DeleteDirectory
System.IO.FileSystem.Tests!ManageFileSystem.Dispose
System.IO.FileSystem.Tests!ManageFileSystem.Finalize
libcoreclr.so!FastCallFinalizeWorker
libcoreclr.so!MethodTable::CallFinalizer
libcoreclr.so!MethodTable::CallFinalizer
libcoreclr.so!FinalizerThread::DoOneFinalization
libcoreclr.so!FinalizerThread::DoOneFinalization
libcoreclr.so!FinalizerThread::FinalizeAllObjects
libcoreclr.so!FinalizerThread::FinalizerThreadWorker
libcoreclr.so!ManagedThreadBase_DispatchOuter
libcoreclr.so!ManagedThreadBase_DispatchOuter
libcoreclr.so!ManagedThreadBase_DispatchOuter
libcoreclr.so!ManagedThreadBase_DispatchOuter
libcoreclr.so!ManagedThreadBase_DispatchOuter
libcoreclr.so!ManagedThreadBase::FinalizerBase
libcoreclr.so!ManagedThreadBase::FinalizerBase
libcoreclr.so!FinalizerThread::FinalizerThreadStart
libcoreclr.so!CorUnix::CPalThread::ThreadEntry
libpthread.so.0!start_thread
libc.so.6!clone