Remove ComponentsError (#3716)

# Objective
`ComponentsError` is unused and should be removed.

Fixes #3707 

## Solution

Remove `ComponentsError`.

crates/bevy_ecs/src/component.rs

@@ -9,7 +9,6 @@ use std::{
     alloc::Layout,
     any::{Any, TypeId},
 };
-use thiserror::Error;
 
 /// A component is data associated with an [`Entity`](crate::entity::Entity). Each entity can have
 /// multiple different types of components, but only one of them per type.
@@ -244,16 +243,6 @@ pub struct Components {
     resource_indices: std::collections::HashMap<TypeId, usize, fxhash::FxBuildHasher>,
 }
 
-#[derive(Debug, Error)]
-pub enum ComponentsError {
-    #[error("A component of type {name:?} ({type_id:?}) already exists")]
-    ComponentAlreadyExists {
-        type_id: TypeId,
-        name: String,
-        existing_id: ComponentId,
-    },
-}
-
 impl Components {
     #[inline]
     pub fn init_component<T: Component>(&mut self, storages: &mut Storages) -> ComponentId {