No longer needed to pass project argument to commit methods.

app/controllers/projects/commit_controller.rb

app/models/commit.rb

app/models/merge_request.rb

app/services/git_push_service.rb

app/services/notification_service.rb

app/services/projects/participants_service.rb

app/views/projects/commits/_commit.html.haml

lib/gitlab/note_data_builder.rb

lib/gitlab/push_data_builder.rb

spec/models/commit_spec.rb