core: ignore no known remotes (#2399) #4173

Job	Run time
ubuntu-20.04 (mavsdk, hunter)	4m 19s
ubuntu-20.04 (mavsdk_server, superbuild)	46m 5s
ubuntu-22.04 (mavsdk_server, superbuild)	37m 33s
coverage (ubuntu-20.04)	6m 35s
alpine 3.19.0 (musl)	39m 2s
Ubuntu/Debian packaging (Ubuntu 20.04)	8m 16s
ubuntu-20.04 (package, non-mavsdk_server)	7m 26s
android-arm	22m 43s
ubuntu-22.04 (package, non-mavsdk_server)	6m 0s
linux-armv6	6m 38s
linux-armv6-musl	37m 28s
android-arm64	21m 45s
linux-armv7	6m 33s
android-x86	21m 27s
linux-armv7l-musl	37m 18s
linux-arm64	6m 44s
android-x86_64	21m 24s
linux-arm64-musl	39m 55s
macOS x64	39m 54s
linux-arm64-lts	6m 5s
macOS arm64	19m 16s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	5m 55s
macOS framework x64	52m 25s
ubuntu-22.04 (style and proto check)	24m 42s
macOS framework arm64	20m 18s
ios	1h 2m 21s
Windows	1h 22m 55s
ios_simulator_x64	31m 34s
ios_simulator_arm64	1h 16m 5s
iOS XCFramework	1m 33s
	13h 20m 14s

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