Use RemoteInvoke with tracing tests (dotnet/corefx#34645)

Use RemoteInvoke with tracing tests (dotnet/corefx#34645)

Various test projects validate that EventSource data is being appropriately generated.  Since these tests can run concurrently with others in the process, they should be done as out-of-process such that they don't interfere with each other, but some test projects aren't doing that.  This fixes that, ensuring we're using RemoteInvoke everywhere we should be.

Commit migrated from https://github.com/dotnet/corefx/commit/827f91c666c2b40e078c3f1df7a7e5ab13781eaa