Remove step counter in step name for TLA and PEB; ATR-26319

In the menu generations, the TLA and PEB steps are aligned separately from the rest of the chain steps. When two chains requiring the same TLA/PEB step have the same last step but different intermediate steps, so that they have different length, the TLA/PEB alignment creates two different steps, having different ComboHypos, that are then realigned with the result of having one only Step name but still two different ComboHypos. The result is that one of the ComboHypo is not configured correctly. The solution is to remove the step counter in the original TLA/PEB step name, so that the same ComboHypo is picked, regardless the length of the chain. This fixes the issue raised in ATR-26319.