FfiClient state guarding, additional testing coverage #672

Job	Run time
Build (docker-linux-x64)	33m 25s
clang-format	24s
Build (docker-linux-arm64)	25m 30s
clang-tidy	10m 58s
Build (linux-arm64)	17m 32s
Build (macos-x64)	29m 3s
Build (linux-x64)	20m 46s
Build (macos-arm64)	12m 4s
Build (windows-x64)	34m 53s
License Check / License Check	5s
Pin Check / Pin Check	14s
Build (cpp-example-collection-linux-arm64)	6m 25s
Build (cpp-example-collection-x64)	4m 15s
	3h 15m 34s

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