scripts/tracing: Remove scripts/tracing/draw_functrace.py

scripts/tracing: Remove scripts/tracing/draw_functrace.py

The draw_functrace.py hasn't worked in years. There's better ways to
accomplish the same thing (via libtracefs). Remove it.

Link: https://lore.kernel.org/linux-trace-kernel/20250210-debuginfo-v1-1-368feb58292a@purestorage.com/
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Uday Shankar <ushankar@purestorage.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/20250307103941.070654e7@gandalf.local.home
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>