Fix duplicated subscribed topics not deduplicated #949

Job	Run time
Formatting Check	1m 37s
Lint	26m 49s
Run unit tests	19m 15s
Build the Wireshark dissector (ubuntu-latest)	2m 10s
Build CPP Client on Windows x86	31m 42s
Build CPP Client on Windows x64	33m 7s
Build Deb x86_64	12m 15s
Build with the C++20 standard	5m 40s
Build Alpine x86_64	12m 31s
Build CPP Client on macOS with static dependencies	8m 26s
Build RPM x86_64	11m 28s
Check Completion	3s
	2h 45m 3s

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