Fix: Update the ExtractedView & Frustum when the ExtractedPointLight has changed

[kfc35]

Objective

• Fixes Example spotlight and rect_light render incorrectly #23997 for spotlight (rect_light fixed with fix(Rect Lights): rect_lights should be written out to GpuLights #24024 already)
• The spotlight example changes the transform of each spotlight, but the ExtractedView and the Frustum for the spotlight never updates, hence why the light doesn’t look complete for subsequent frames.

Solution

• For Spot lights (and Point lights since those were also affected), update the ExtractedView and the Frustum if its corresponding ExtractedPointLight has changed.
• AFAIK this isn’t needed for Directional lights because ExtractedViews aren’t re-used — they’re made anew in prepare_lights

Testing

• cargo run --example spotlight works as desired.
• cargo run --example async_channel_pattern works as desired (for PointLight testing)
• @Zeophlite assist with the example runner (was done before the frusta change though)

[kfc35]

this seemed like an oversight that I spotted so I just added this, it’s unrelated to the fix. I can remove this if desired but it’s small so I felt OK sneaking it in

[kfc35]

Thanks @Zeophlite for the assist with the example runner!

I inspected those results and learned that the frusta need to be included in the components to update, so I included those as well in the most recent commit. I also learned that the async_channel_pattern is a great example to observe a transforming PointLight.

Now, the async_channel_pattern example looks as it should from before the “render spot and point lights once” change. The shadows actually stick to the boxes as the lights rotate around and they don’t disappear weirdly. I’ve got more confidence that this is the right fix.