camera_server: prevent double ack+message #4227

Job	Run time
Ubuntu/Debian packaging (Ubuntu 20.04)	8m 48s
coverage (ubuntu-20.04)	6m 7s
alpine 3.19.0 (musl)	11m 28s
ubuntu-20.04 (package, non-mavsdk_server)	7m 43s
ubuntu-22.04 (package, non-mavsdk_server)	6m 8s
android-arm	6m 32s
ubuntu-24.04 (package, non-mavsdk_server)	6m 51s
linux-armv6-musl	12m 55s
android-arm64	6m 42s
linux-armv6	5m 54s
linux-armv7l-musl	12m 31s
android-x86	6m 28s
linux-armv7	5m 44s
linux-arm64-musl	13m 19s
android-x86_64	6m 28s
ios	52m 41s
linux-arm64	5m 49s
ios_simulator_x64	7m 29s
linux-arm64-lts	5m 13s
ios_simulator_arm64	43m 1s
macOS x64	19m 1s
ubuntu-20.04 (mavsdk, hunter)	4m 35s
macOS arm64	6m 35s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	6m 17s
macOS framework x64	16m 44s
ubuntu-24.04 (style and proto check)	1m 33s
macOS framework arm64	7m 37s
ubuntu-20.04 (mavsdk_server, superbuild)	13m 50s
Windows	12m 24s
ubuntu-22.04 (mavsdk_server, superbuild)	11m 9s
ubuntu-24.04 (mavsdk_server, superbuild)	12m 57s
ubuntu-24.04 (mavsdk_server, superbuild)	12m 23s
ubuntu-24.04 (mavsdk_server, superbuild)	12m 51s
iOS XCFramework	1m 14s
	6h 17m 1s

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