Make 3D editor gizmos and debug shapes ignore fog

[Calinou]

This makes them easier to see in their intended colors in scenes with fog. This also fixes issues with gizmo colors changing if viewed behind fog with Sun Scatter enabled.

• See Render editor viewport gizmos and UI on a separate render pass to prevent them from being affected by post-processing effects godot-proposals#2138
  and Implement render mode fog_disabled and BaseMaterial3D setting Disable Fog #81286.

Testing project: test_fog_3d_gizmos.zip

Preview

Before	After

[JekSun97]

Looks logical and convenient

[atirut-w]

Is it possible for them to ignore environment settings entirely?

[Calinou]

Is it possible for them to ignore environment settings entirely?

Not without large changes (especially if you want to preserve depth awareness), as it would require rendering 3D gizmos on a separate pass.

[atirut-w]

Bummer. This is something, at least.

[smix8]

Navigation looks fine.

[akien-mga]

Thanks!