Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Adds subnav to all views apart from issue and MR views. The full list is available in screenshots below.
It also adds some JS to the builds page to simply handle the repositioning of the fixed position sidebar with the addition of the subnav.
UX and apparently regression .
Closes #18844 (closed).
master
