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Fixes #60127
This ensures that each script is parsed only once in search of the icon when updating scene tree. It makes loading scenes and especially editing much faster. It introduces a small issue that when you change script icon, it won't properly refresh until cache is cleared (right now it's cleared when any scene is closed). But this is a very minor issue compared to what this fixes.
I originally made this PR for 3.x branch, I couldn't reproduce the issue in master, as I don't have a "complex" enough 4.0 project. But I at least tested that it doesn't break anything.
Here's the original 3.x patch for easier cherry-picking: 0001-Cache-script-icons-in-editor.patch.txt