[WebProfilerBundle] Custom categories generate too many elements in the timeline legend #33536
Description
Symfony version(s) affected: all
Description
While working on #33535 I realized that the buttons for the custom Stopwatch categories are generated five times (although only one is visible):
This issue was present before working on #33535, so it's completely unrelated.
How to reproduce
Profile any Symfony app and add at least one custom Stopwatch section.