Create terminal button in new branch view

After using the new branch button in an issue I want to press a terminal button.

We need to add a terminal button to each branch view, for example to https://gitlab.com/sytses/admin-test/tree/1-test-branch

Todo from: https://about.gitlab.com/handbook/sales/idea-to-production-demo/

Flow of the demo made possible:

1. Plan issue by dragging it on the issue board
2. Click on the the issue to open it
3. Press new branch button in issue
4. Press terminal button

Mockups

• "Running pipeline and creating new environment"

• "Running pipeline and updating review/23968-create-terminal-button-in-new-branch-view [actions]"

• "Pipeline failed [minigraph]" (With [actions] if already deployed before.)

• "Deployed to review/23968-create-terminal-button-in-new-branch-view less than a minute ago [actions]"