Remove building scene, add code execution loading indicator to bottom-right controls (#3691)

* Remove isFirstRender because isExecuting means the same and remove building scene

* add small makefile util

* Remove waiting for building scene prompt

* Add a new model state indicator

* fmt lint tsc

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Co-authored-by: Frank Noirot <frank@kittycad.io>

src/components/ModelingMachineProvider.tsx

@@ -160,9 +160,7 @@ export const ModelingMachineProvider = ({
 
             store.videoElement?.pause()
 
-            kclManager.isFirstRender = true
             kclManager.executeCode().then(() => {
-              kclManager.isFirstRender = false
               if (engineCommandManager.engineConnection?.idleMode) return
 
               store.videoElement?.play().catch((e) => {