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.Client/Botany/PotencyVisualsSystem.cs

@@ -1,4 +1,5 @@
 using Content.Shared.Botany;
+using Content.Client.Botany.Components;
 using Robust.Client.GameObjects;
 
 namespace Content.Client.Botany;