perf test subcmd help: Add exclude disjoint subcmd names

perf test subcmd help: Add exclude disjoint subcmd names

The test is based on an error/fix posted to linux-perf-users.

Reported-by: Sri Jayaramappa <sjayaram@akamai.com>
Reviewed-by: Sri Jayaramappa <sjayaram@akamai.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Guilherme Amadio <amadio@gentoo.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Closes: https://lore.kernel.org/linux-perf-users/20251202213632.2873731-1-sjayaram@akamai.com/
Closes: https://urldefense.com/v3/__https://lore.kernel.org/linux-perf-users/20251202213632.2873731-1-sjayaram@akamai.com/__;!!GjvTz_vk!XehekKNUE4Ib_tvqIH6PMIIhly4X3BZ-Y40RC1HKMQ-6OdYEFvUPQhyWv_gk9vsRRN4_RcOLS2Bh0CQ$
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>