Class that permits run coroutines manually, can be useful to run coroutines in Unity Editor.

EditorCoroutineRunner.cs

using System.Collections;
using System.Collections.Generic;
using UnityEditor;

public static class EditorCoroutineRunner
{
	private static List<IEnumerator> _coroutineList = new List<IEnumerator>();
    
	static EditorCoroutineRunner()
	{
		EditorApplication.update += ExecuteCoroutine;
	}
    
	private static void ExecuteCoroutine()
	{
		for (var i = 0; i < _coroutineList.Count; i++)
		{
			if (!_coroutineList[i].MoveNext())
			{
				_coroutineList.RemoveAt(i);
				i--;
			}
		}
	}

	public static void StartCoroutine(IEnumerator coroutine)
	{
		_coroutineList.Add(coroutine);
	}
}