* mention benchmarking and profiling in the workflow description
* remove a very general doc about PerfView which was not refferenced by other docs
* update the performance-guidelines.md doc
* Remove old debug instructions about using dumpling
* remove dumpling reference
* stop invoking dumpling
* remove unused perf scripts
* more dumpling references
* Remove unused perf scripts and change instructions to point to perf repo
* add updated SOS link