Frontend for multiple matches - part-4

What does this MR do and why?

This MR is a part of bigger issue Frontend for multiple matches in single file.

This adds status bar and tweaks paging

MR	status
Frontend for multiple matches - part-1	merged
Frontend for multiple matches - part-2	merged
Frontend for multiple matches - part-3	merged
Frontend for multiple matches - part-4	👈 you are here
Frontend for multiple matches - part-5	ready to merge

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Enable the forks filter FF

   echo 'Feature.enable(:zoekt_multimatch_frontend)' | rails c

2. Make sure advanced search is installed and enabled
3. Make sure you enable zoekt.
4. Visit search page http://gdk.test:3000/search
5. Search code using namespace where zoekt is enabled
6. Tracking should be issued when clicked on show more, show less, click line or click blame
7. Each file card header is sticky.
8. Show less also scrolls to the top of file card.

Related to #450735 (closed)