Highlight note code and edit preview
More highlighting fixes! Highlighting wasn't applied all the way for
code in notes, diff notes diffs and diff preview (on the file edit page).
The CSS changes further unify the styling for file-content highlighting,
diff highlighting and note code highlighting.
See merge request !2594
All inputs of type `search` will have the gray background
and search icon centered.
Because the search magnifier is a bg image,
I had to hide it with `[value=""]`.
I added a little javascript to make sure each input always has it's
own value.
Fix alignment issues after a fix on titles weight
Fixes#8102. Fixes#3956. This fixes an alignment regression introduced by !2422. Sorry about that! :/
## Commit title alignment fixed

**The fact that the first row has a smaller height than the other rows was not introduced by !2422 (I've checked by reverting 818607f0 on `master`).**
## Tags name in list

See merge request !2431
Fix caching issue where build status was not updating in project dashboard
The project dashboard page would show a stale build status since the caching key did not depend on it. Fix by adding the commit status if CI is applicable.
Closes#3268
See merge request !2353
Dropdowns for clone. Star and Fork with new count areas. Star and Unstarred Works now
Fixes#2876 and #3482
Used existing styles. <br/>
Did not attempt to make pixel perfect as styles already exist. <br/>

See merge request !2156
Fix headers of milestone and snippet show pages
Fix layout, and move "Edit" button to very right just like issue/MR.
Before:


After:


cc @skyruler
cc @rspeicher 8.3 please!
See merge request !2104