Only show hover state on links and buttons

What does this MR do?

Removes hover style for nodes that are either links or buttons in the pipeline graph:

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests
  • 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 #32517 (closed)