Exclude esm folder from icons alias

[Janpot]

Haven't ran into this, but just to give the good example.

Also fixing tooltips on the NumberFormat property control that is used in the Metric component. (Saw this warning popping up while testing the other change)

MarkdownTooltip.tsx:32 Warning: Failed prop type: Invalid prop `children` supplied to `ForwardRef(Tooltip2)`. Expected an element that can hold a ref. Did you accidentally use a plain function component for an element instead? For more information see https://mui.com/r/caveat-with-refs-guide
    at Tooltip2 (http://localhost:3000/_toolpad/@fs/Users/janpotoms/Projects/toolpad/packages/toolpad-app/node_modules/.vite/deps/chunk-UYZY5CSJ.js?v=d7ee65a1:290:17)
    at MarkdownTooltip (http://localhost:3000/_toolpad/@fs/Users/janpotoms/Projects/toolpad/packages/toolpad-app/src/components/MarkdownTooltip.tsx:22:3)
    at PropertyControl (http://localhost:3000/_toolpad/@fs/Users/janpotoms/Projects/toolpad/packages/toolpad-app/src/components/PropertyControl.tsx:19:3)
    at GridColumnsPropEditor (http://localhost:3000/_toolpad/propertyControls/NumberFormat.tsx?t=1693561880565:20:3)
    ...