fix: route v2 callables through wrapV2 when platform is gcfv2#311

IzaakGough wants to merge 3 commits into

masterfirebase/firebase-functions-test:masterfrom

@invertase/fix-wrap-v2-callable-detectionfirebase/firebase-functions-test:@invertase/fix-wrap-v2-callable-detectionCopy head branch name to clipboard