Do not run score cards on forks of flutter/flutter. (#97603)
Do not run score cards on forks of flutter/flutter. (#97603)

As a general rule all the .github workflows enabled for flutter/flutter
should not run on forks.

Bug: https://github.com/flutter/flutter/issues/97599
tvolkert/flutter,tvolkert/flutter,tvolkert/flutter,flutter/flutter,flutter/flutter,flutter/flutter,tvolkert/flutter,flutter/flutter,flutter/flutter,flutter/flutter,tvolkert/flutter,flutter/flutter,flutter/flutter,flutter/flutter,tvolkert/flutter,flutter/flutter,tvolkert/flutter,tvolkert/flutter,tvolkert/flutter,tvolkert/flutter