Update `Ethernet Diagnostics Cluster` to match the spec #82280

Job	Run time
Build on Darwin (clang, python_lib, simulated)	1h 30m 10s
Build on Linux (fake, gcc_release, clang, simulated)	2h 48m 59s
Build on Linux (coverage)	23m 12s
Build on Linux (gcc_debug)	1h 8m 17s
Build on Linux (python_lib)	31m 14s
Build on Linux (python lighting-app)	10m 11s
	6h 32m 3s

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