perf python tracepoint.py: Change the COMM using setproctitle if available

Otherwise when debugging we see just "python" in perf, top, etc.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20250312203141.285263-4-acme@kernel.org


Signed-off-by: Namhyung Kim <namhyung@kernel.org>