remove old/unused b+tau chains from dev menu (v2)

This MR is the same as !71284, just re-starting from a fresh checkout.

The purpose is to remove old b+tau test chains from the Dev menu as discussed in ATR-29269.

Tagging @cpollard and @lshi for bjet triggger

Tagging @smwang and @slai for the tau trigger

Tagging @lidiaz and @gipezzul for the menu