FfiClient state guarding, additional testing coverage #638

Job	Run time
Build (linux-arm64)	17m 7s
Build (docker-linux-x64)	32m 42s
Build (windows-x64)	33m 1s
Build (macos-x64)	31m 37s
clang-tidy	10m 24s
Build (macos-arm64)	10m 35s
clang-format	29s
Build (linux-x64)	21m 13s
Pin Check / Pin Check	16s
License Check / License Check	6s
Build (docker-linux-arm64)	25m 47s
Build (cpp-example-collection-linux-arm64)	7m 46s
Build (cpp-example-collection-x64)	4m 46s
	3h 15m 49s

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