Replaced nlunit-test with pw_unit_test in src/lib/dnssd/platform/ #94957

Job	Run time
Build on Linux (fake, gcc_release, clang, simulated)	1h 33m 23s
Build on Linux (fake, gcc_release, clang, simulated)	1h 33m 23s
Build on Linux (gcc_debug)	56m 9s
Build on Linux (gcc_debug)	56m 9s
Build on Darwin (clang, python_lib, simulated)	47m 50s
Build on Darwin (clang, python_lib, simulated)	1h 4m 37s
Build on Linux (coverage)	14m 36s
Build on Linux (coverage)	14m 36s
Build on Linux (python lighting-app)	10m 8s
Build on Linux (python lighting-app)	10m 8s
Build on Linux (python_lib)	24m 37s
Build on Linux (python_lib)	24m 37s
	8h 30m 13s

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