45740 Do not delete output directory during flutter build ios-framework

45560 Always compile with isysroot on iOS to point to SDK root

45436 Always compile with -isysroot flag on iOS to point to SDK root

45189 Remove chmod to make Flutter framework headers unwritable

45136 Remove FLUTTER_DEVICELAB_XCODE_PROVISIONING_CONFIG code paths

44633 Turn on bitcode for integration tests and add-to-app templates

44625 Release startup lock during long-lived build ios framework

44324 Add swift_versions to plugin template podspec, include default CocoaPod version

43915 Observe logging from VM service on iOS 13

43553 Pass environment variables through to xcodebuild