GHA: Generate .import files for GDExtension icons #389

Job	Run time
cache-env	1s
🧪 Unit tests	2m 57s
🍎 macOS / Editor (x86_64, release)	3m 11s
🐧 Linux / Editor (x86_64, release)	12m 38s
🪟 Windows / Editor (x86_64, release)	6m 55s
🔌 GDExtension / 🐧 Linux (x86_64, release)	18s
🐧 Linux / Template (x86_64, release)	8m 42s
🪟 Windows / Editor .NET (x86_64, release)	9m 39s
🍎 macOS / Editor (arm64, release)	3m 21s
🔌 GDExtension / 🐧 Linux (x86_64, debug)	20s
🔌 GDExtension / 🪟 Windows (x86_64, release)	2m 43s
🔌 GDExtension / 🪟 Windows (x86_64, debug)	2m 19s
🔌 GDExtension / 🍎 macOS (universal, release)	48s
🔌 GDExtension / 🍎 macOS (universal, debug)	55s
🔌 GDExtension / 🌐 Web (wasm32, release)	22s
🔌 GDExtension / 🌐 Web (wasm32, debug)	22s
🔌 GDExtension / 📦 Package extension	29s
🍎 macOS / Make macOS Bundles (tmp-macos, false, true)	42s
	56m 42s

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