Move populateSketchbookMenu to a separate thread #253

Job	Run time
Create Pull Request Build for linux (arm)	1h 11m 38s
Create Pull Request Build for linux (x64)	1m 9s
Create Pull Request Build for windows (x64)	1m 29s
Create Pull Request Build for macos (x64)	1m 31s
Create Pull Request Build for macos (aarch64)	50s
Create Pull Request Build for linux (aarch64)	1m 0s
	1h 17m 37s

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