tracing: Add a test for ftrace_parse_event_string() The parsing logic is a bit complicated and about to become more so. Add a unit test to avoid regressions. Link: https://patch.msgid.link/20260908-tracing-cli-event-filter-v2-5-05396a3fb663@linutronix.de Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>