test/base: Add support to get rtapp task names from trace

All rt-app generated tasks have a numerical suffix since fork support has
been mered. For forked tasks specifically we can also end up with multple
tasks with the same name specified in the rt-app profile.

With the new rt-app version thus we cannot relay anymore on task names
defined in the rtapp profile.

Rename the current Bundle::rtapp_tasks into Bundle::rtapp_tasks_from_profile
and add a new implementation for the original method.
Match profile task name with trace task names and make them available via
the original property.

This fix should maintain backward compatibility with old rt-app version.

Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>