Deterministic loading of plugins

[MWild67]

The plugins are discovered by querying files in directories. This behavior is different depending on the underlying filesystem, means:
Window/NFTS: alphanumerical
Linux/ext: "inode" order

This leads to the situation that the loading is different when you locally test with Windows and on the pipeline the tests are running on a linux agent.

This is per se a bit inconsistent, but for us it is a problem as we have a plugin which is overwriting the tracing. We enforce by the plugin-name that our plugin is loaded last, which now only works with NTFS.

The "fix" for this would be quite easy:

internal sealed class RuntimePluginLocator : IRuntimePluginLocator
{
   ....
   public IReadOnlyList<string> GetAllRuntimePlugins()
   {
      ...
      return _runtimePluginLocationMerger.Merge(allRuntimePlugins).OrderBy(plugin => plugin).ToList();  // Add ordering of the returned list
   }
}

This would always give a sorted list back and the loading is independent of the behavior of the filesystem, which is a small change but would help us a lot.