FfiClient state guarding, additional testing coverage #671

Job	Run time
clang-tidy	10m 59s
Build (docker-linux-arm64)	26m 20s
clang-format	28s
Build (linux-x64)	21m 1s
Build (macos-arm64)	9m 38s
Build (linux-arm64)	16m 22s
Build (docker-linux-x64)	33m 1s
License Check / License Check	7s
Pin Check / Pin Check	16s
Build (windows-x64)	42m 28s
Build (macos-x64)	1h 0m 13s
Build (cpp-example-collection-linux-arm64)	4m 47s
Build (cpp-example-collection-x64)	6m 41s
	3h 52m 21s

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