wtperf is the older performance testing infrastructure used by WiredTiger. Remove the wtperf workload as a newer workgen performance workload will be added instead.

Please include enough context to make triage and story pointing simple. We have a guide about what to include here, tl;dr include:

• A summary from the consumers' point of view,
• A definition of done,
• The reproducing steps, and
• Links to other relevant tickets/resources.