Summary: This PR splits the linting of the flipperkit pods into different subspecs. This will fasten the overall validation time. Before, all the pods were validated in a serialised fashion, but now its done in a parallel way. This brings down the total validation time from 2+ hrs to ~ 25mins ## Changelog - Split the validation of the FlipperKit pod into parallelised subspecs Pull Request resolved: https://github.com/facebook/flipper/pull/2540 Test Plan: https://github.com/facebook/flipper/actions/runs/986790548 Reviewed By: passy Differential Revision: D29489716 Pulled By: priteshrnandgaonkar fbshipit-source-id: 55557c581d56ee01796ca64405cf78b647d2a68b