Remove banner from pipelines page

Closes #38641, #39051, and #38827

See merge request gitlab-org/gitlab-ce!14849

(cherry picked from commit 7996be60)

87cff693 Remove banner from pipelines page
c88fef16 Format banner like service desk
05f21311 Update link to settings page instead of documentation page
68343b99 Improve mobile view
ea852324 Removes unneeded CSS
4eac69c5 Remove extra class breaking layout in smaller screens
db5ebef3 Improve check for permissions on empty project page