Remove unnecessary Lazy initialization from PluginFile.State in PluginFile.cs

[Nigusu-Allehu]

The PluginFile class currently uses a Lazy<PluginFileState> for its State property:

public Lazy<PluginFileState> State { get; }

This was originally implemented because we used to perform Authenticode verification on plugins on Windows, which was an expensive operation. The Lazy initialization ensured that this verification was deferred until necessary.

However, since PR #6042 has been merged, we no longer perform Authenticode verification on plugins. Therefore, the Lazy initialization is no longer needed.