New design for cancel / stop pipeline confirmation

Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/28849

Path Current Screenshot New Title New Description New Buttons
pipelines/(Stop) null Stop pipeline ‘#[Pipeline ID]’? You’re about to stop pipeline #[Pipeline ID]. To retry this pipeline instead, press Retry pipeline. [Cancel] [Stop pipeline]
pipelines/(Retry) Retry pipeline ‘#[Pipeline ID]’? You’re about to retry pipeline #[Pipeline ID] [Cancel] [Retry pipeline]

Existing discussion

Screen_Shot_2017-12-20_at_11.04.06

(https://gitlab.com/gitlab-org/gitlab-ce/issues/28849#note_52044250)

Screen_Shot_2017-12-20_at_11.04.27

(https://gitlab.com/gitlab-org/gitlab-ce/issues/28849#note_52067755)

Edited by Hazel Yang