feat: Remove Simulator Tools window

[simon-lemay-unity]

MTT-2775

Remove the 'Simulator Tools' window that was accessible through the 'NetCode' menu item. It's now also possible to set these parameters through the 'Debug Simulator' section of the 'Unity Transport' component, and having two places to set the same settings was confusing. The component is the preferred way since it offers more advantages (different settings for different components, can be saved in the project, easier to discover, more consistent with other settings). The separate window could also be quite confusing since it used editor preferences for the settings (it's easy to forget they're set and they remain across projects) and because it only applied to the UTP adapter (since the menu is global, it was easy to think it could apply to other transports too).

Changelog

com.unity.netcode.adapter.utp

• Removed: Removed the 'NetCode > Simulator Tools' menu to reduce confusion. The only way to set debug simulator parameters is now through the 'Debug Simulator' section of the 'Unity Transport' component.

Testing and Documentation

• No tests have been added.
• No documentation changes or additions were necessary.