[BUG] Debug env renders in rgb_array mode

[sash-a]

Describe the bug

Even when the mode rgb_array is passed into rendering for the debug env it still displays a window, this can be a nuisance when running locally.
It is possible that we will deprecate this environment in the future so this upgrade should only happen if we decide to keep this environment

To Reproduce

Steps to reproduce the behavior:

1. Add the MonitorExecutorEnvironmentLoop to your system
2. Use the Debug Env
3. View the windows that pop up

Expected behavior

Rendering should be done in the background and saved to a folder instead of displayed on screen while being saved.

Proposal for a fix

In the render method for debug env handle the rgb_array case by not rendering to the screen. I am not sure how to do this, but I imagine pygame has a way.

Definition of done

When the MonitorExecutorEnvironmentLoop is added no rendering windows show up during a run.

Mandatory checklist before making a PR

• [ ] The success criteria laid down in “Definition of done” are met.
• [ ] Code is documented - docstrings for methods and classes, static types for arguments.
• [ ] Code is tested - unit, integration and/or functional tests are added.
• [ ] Documentation is updated - README, CONTRIBUTING, or other documentation.
• [ ] All functional tests are green.
• [ ] Link experiment/benchmarking after implementation (optional).