Add `markUnhandledAsFatal` to `SentryOptions`#1720

denrase wants to merge 2 commits intorelease/8.0.0getsentry/sentry-dart:release/8.0.0from

feat/mark-flutter-errors-as-warning-or-errorgetsentry/sentry-dart:feat/mark-flutter-errors-as-warning-or-errorCopy head branch name to clipboard