[camera_android_camerax] Fixes crash on hot restart caused by stale observers#10529

raju-muliyashiya wants to merge 2 commits intoflutter:mainflutter/packages:mainfrom

raju-muliyashiya:Fixes-crash-on-hot-restart-caused-by-stale-observersraju-muliyashiya/flutter_packages:Fixes-crash-on-hot-restart-caused-by-stale-observersCopy head branch name to clipboard