Add connection error subscription #4323

Job	Run time
Coverage (ubuntu-22.04)	11m 23s
alpine 3.19.0 (musl)	39m 54s
ubuntu-20.04 (package, non-mavsdk_server)	11m 57s
android-arm	21m 7s
ubuntu-22.04 (package, non-mavsdk_server)	10m 31s
android-arm64	21m 51s
linux-armv6	11m 45s
linux-armv6-musl	38m 4s
linux-armv7	11m 31s
android-x86	21m 34s
linux-armv7l-musl	38m 33s
ubuntu-24.04 (package, non-mavsdk_server)	11m 40s
linux-arm64	11m 59s
android-x86_64	21m 10s
linux-arm64-musl	41m 35s
linux-arm64-lts	10m 45s
ios	1h 50m 25s
ubuntu-24.04 (style and proto check)	27m 0s
ios_simulator_x64	30m 54s
macOS x64	18m 55s
ubuntu-20.04 (non-mavsdk_server, hunter)	8m 39s
ios_simulator_arm64	1h 50m 30s
macOS arm64	20m 29s
ubuntu-22.04 (non-mavsdk_server, hunter)	8m 1s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	7m 3s
macOS framework x64	47m 26s
ubuntu-24.04 (non-mavsdk_server, hunter)	8m 32s
ubuntu-22.04 (non-mavsdk_server, non-superbuild)	6m 9s
macOS framework arm64	20m 9s
ubuntu-20.04 (mavsdk_server, superbuild)	47m 22s
ubuntu-24.04 (non-mavsdk_server, non-superbuild)	6m 55s
ubuntu-22.04 (mavsdk_server, superbuild)	38m 16s
Windows	5m 42s
ubuntu-24.04 (mavsdk_server, superbuild)	44m 18s
ubuntu-24.04 (mavsdk_server, superbuild)	43m 18s
ubuntu-24.04 (mavsdk_server, superbuild)	44m 26s
iOS XCFramework	1m 33s
	16h 31m 21s

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