change build list height to show 6,5 builds + improve padding of list, with firs…

What does this MR do?

lets the builds dropdown in the pipeline graph show only 6,5 builds instead of 7.. so its easier to know if a user can scroll

Are there points in the code the reviewer needs to double check?

I changed the padding of the list to 0 and gave the 8px top and bottom padding from the ul to the first-child and last-child li elements inside the list. Is that okey. Reason why, is that it breaks the list off correctly at the edges:)

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Why was this MR needed?

easier to let people know when its possible to scroll.. to expect more builds

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #24017 (closed)