Drop whyrun_supported? from prod cookbooks
Drop whyrun_supported? from prod cookbooks

Summary:
`whyrun_supported?` defaults to true in Chef 13+, and so is no longer
needed

https://docs.chef.io/workstation/cookstyle/chef_modernize_whyrunsupportedtrue/

Reviewed By: joshuamiller01

Differential Revision: D33108056

fbshipit-source-id: f39143fce41f4881c0fb42bdab4ed82a231b14e5

facebook/IT-CPE,facebook/IT-CPE,facebook/IT-CPE