https://tedliou.com/archives/unity-find-all-objects-by-interface/

Extension.FindInterfacesOfType.cs

using System.Collections.Generic;
using System.Linq;
using UnityEngine;

public static partial class Extension
{
    public static List<T> FindInterfacesOfType<T>(this GameObject _)
    {
        return Object.FindObjectsOfType<MonoBehaviour>().OfType<T>().ToList();
    }
}