[Task] rsx: Finish MSAA implementation

[kd-11]

MSAA work is completed for vulkan but is missing for OpenGL. It also doesn't work with the interpreter.
We already have most of the kinks worked out by now, so this is long overdue.

[Darkhost1999]

This issue ties into #12166

[digant73]

This issue ties into #12166

That is for OpenGL where the Anti-Aliasing setting is not enabled at all. While MSAA is not working on Vulkan with Interpreter only shader

[kd-11]

Both need to be fixed since OpenGL also supports the interpreter.
In the past when MSAA was added, I decided to only add to one backend while we figured out the best way to integrate the feature. OGL has a stubbed implementation because of that. The interpreters use shared code and it doesn't support MSAA at the moment. Makes sense to just do both (start with OGL then fix interpreter so it works on all backends)