Revert "don't use bevy_pbr for base bevy_gizmos plugin"

[mockersf]

Objective

• don't use bevy_pbr for base bevy_gizmos plugin #17581 broke gizmos
• Fixes Example 3d_viewport_to_world: gizmo is displayed in the wrong position #18325

Solution

• Revert don't use bevy_pbr for base bevy_gizmos plugin #17581
• Add gizmos to testbed

Testing

• Run any example with gizmos, it renders correctly

[IceSentry]

Uh, I'm not sure that PR was the issue? I mean, yes it broke gizmos when it was merged, but when it was created it didn't break like that. I think it might have been an issue with the merge to main but the original PR was correct.

[mockersf]

Uh, I'm not sure that PR was the issue? I mean, yes it broke gizmos when it was merged, but when it was created it didn't break like that. I think it might have been an issue with the merge to main but the original PR was correct.

Yup, main probably changed something between the time it was opened and when it was merged, so it should be redone for current main

[alice-i-cecile]

Agreed on needing a redo. Let's revert for now though.