Fix height of input groups
What does this MR do?
- Overrides Bootstrap's $input-font-sizeto be14px
- Sets max-height on group text input to align with right input
| header | header | 
|---|---|
|  |  | 
Closes #60778 (closed)
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/59254
Edited  by Annabel Dunstone Gray