Game feature plugins load plugin config files incorrectly

Game feature plugins load config files in a different way than normal plugins, which is confusing and can lead to broken behavior unless the developer knows about these issues ahead of time. The loading path for override config files named "PluginNameGame.ini" may need to be special cased, but the loading process for "PluginName.ini" should work the same as normal plugins. Game feature plugins are different because they use LoadExternalIniFile and bypass the config hierarchy so the files are loaded as if they were from the saved folder. This causes two issues:

1. The file needs to be named "PluginName.ini" instead of "DefaultPluginName.ini" to load properly. This is different than other plugins
2. Because they bypass the config cache, normal syntax like "+ClassRedirects" will not work, and you need to use "ClassRedirects" on it's own which does not match documentation

This issue is somewhat similar to [Link Removed], which was a related issue where engine and game plugins loaded from different config files

1. Unzip attached project into it's own folder named UE5MainBlank
2. Regenerate solution, then compile UE5MainBlank
3. Launch the UE5MainBlank editor
4. Open the content browser and enable show plugin content to see the game feature plugins
5. Try to edit the asset /GameFeatureTest/BPMyDerivedActor
6. If the config loading is working properly it will load the blueprint editor, if it is broken it will fail to load because it did not parse the UE5MainBlank\Plugins\GameFeatures\GameFeatureTest\Config\DefaultGameFeatureTest.ini file