release: cut the v13.0.0-next.12 release (angular#43726)

PR Close angular#43726

release: cut the v13.0.0-next.11 release (angular#43707)

PR Close angular#43707

release: cut the v13.0.0-next.10 release (angular#43672)

PR Close angular#43672

release: cut the v13.0.0-next.9 release (angular#43656)

PR Close angular#43656

release: cut the v12.2.8 release (angular#43654)

PR Close angular#43654

release: cut the v13.0.0-next.8 release (angular#43613)

PR Close angular#43613

release: cut the v13.0.0-next.7 release (angular#43539)

release: cut the v12.2.7 release (angular#43537)

release: cut the v13.0.0-next.6 release (angular#43464)

release: cut the v12.2.6 release (angular#43462)