[pigeon] Add the iOS tests in the new harness as non-default options#2867

tarrinneal merged 14 commits into

flutter:mainflutter/packages:mainfrom

stuartmorgan-g:pigeon-test-new-harness-ios-objc-non-defaultstuartmorgan-g/packages:pigeon-test-new-harness-ios-objc-non-defaultCopy head branch name to clipboard