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/Spinner.tsx

@@ -0,0 +1,17 @@
+import { SVGProps } from 'react'
+
+export const Spinner = (props: SVGProps<SVGSVGElement>) => {
+  return (
+    <svg viewBox="0 0 10 10" className={'w-8 h-8'} {...props}>
+      <circle
+        cx="5"
+        cy="5"
+        r="4"
+        stroke="var(--primary)"
+        fill="none"
+        strokeDasharray="4, 4"
+        className="animate-spin origin-center"
+      />
+    </svg>
+  )
+}