PlantHolderVisualizer component system refactor (#10091)

* Converted PlantHolderVisualizer to component and system.

* Cleaned up Botany folder.

* Converted initialization of HydroTrayVisualizer under PlantHolderVisualizerSystem to it's own GenericVisualizer.

* Cleaned up hydro_tray.yml.

Content.Server/Entry/IgnoredComponents.cs

@@ -38,6 +38,7 @@ namespace Content.Server.Entry
             "PipeColorVisuals",
             "FireVisuals",
             "CrematoriumVisuals",
+            "PlantHolderVisuals",
         };
     }
 }