Only show SyncInBackroundDialog for Cloud Projects #756

Job	Run time
Build macOS (x86_64)	26m 45s
Build macOS (arm64)	27m 12s
Ubuntu 20.04 AppImage (x86_64)	27m 37s
Ubuntu 20.04 AppImage (x86_64, gcc 11)	25m 44s
Windows MSVC 2019 (x86)	23m 35s
Source Tarball	2m 34s
Ubuntu 22.04 AppImage (x86_64)	27m 55s
Windows MSVC 2019 (x86_64)	21m 46s
Windows MSVC 2022 (x86)	25m 7s
Windows MSVC 2022 (x86_64)	22m 55s
Package macOS (x86_64, arm64, universal)	8m 58s
	4h 0m 8s

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