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/routes/Onboarding/Introduction.tsx

@@ -107,10 +107,7 @@ function OnboardingWarningWeb(props: OnboardingResetWarningProps) {
           codeManager.updateCodeStateEditor(bracket)
           await codeManager.writeToFile()
 
-          kclManager.isFirstRender = true
-          await kclManager.executeCode(true).then(() => {
-            kclManager.isFirstRender = false
-          })
+          await kclManager.executeCode(true)
           props.setShouldShowWarning(false)
         }}
         nextText="Overwrite code and continue"