IDE0270 should be suppressed by the UnityObjectNullHandlingAnalyzer

[JorisCleVR]

Problem statement

UnityObjectNullHandlingAnalyzer now supresses IDE0029 but not IDE0270. This causes IDE0270 to suggest null coalesce on Unity objects.
The following code example raises IDE0270

using UnityEngine;

class Camera : MonoBehaviour
{
	public void M()
	{
		Camera item = FindItem() as Camera;
		if (item == null)
			throw new System.InvalidOperationException();
	}

	MonoBehaviour FindItem() => null;
}

Proposed solution

Add IDE0270 as a supressor to the UnityObjectNullHandlingAnalyzer

[JorisCleVR]

I know that the issue is not yet approved, but I am confident about this fixing issues. Therefore I already created a pull request to hopefully be merged once this issue is approved: #324

[sailro]

Indeed, thank you for this contribution !