Remove GitLab Duo Chat help menu button

Context

We formally had the call to action to open GitLab Duo Chat in the help menu. We slowly rolled out a different placement of the call to action in the top-right of the screen.

CleanShot_2024-04-22_at_16.55.38

Problem to solve.

We have rolled out the breadcrumbs (top-right of screen) placement to 100% of people. This call to action is prominent. It does not seem necessary to have both calls to action anymore, as the top-right button should be sufficient.

Definition of done

GitLab Duo Chat menu item is removed from the help menu in the navigation.

FYI

Chat is currently made available in the Help menu via the vue code in ee/app/assets/javascripts/ai/tanuki_bot/components/app.vue

For whoever codes this MR: No updates are needed for the docs. We always refer to the button in the upper-right corner, rather than the one on the left sidebar, so removing it will have no effect.

Edited by Torsten Linz