perf test pmu-events: A sub-test per metric table

Break apart the slow "Parsing of PMU event table metrics" tests into one
pair of tests (real and fake PMU) per metric table found, storing the
specific table pointer in priv data. Implement setup_pmu_events_suite()
to dynamically allocate and populate these test cases. Split static
parser tests out into a separate test__parsing_fake_static() test case.
Update test__parsing() and test__parsing_fake() to retrieve the specific
table from priv data and test only that table, maintaining fallback
compatibility if priv is NULL.

Running these individual tests in parallel significantly reduces overall
test execution time.

Assisted-by: Gemini-CLI:Google Gemini 3
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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