B-physics trigger: add additional multiplicity check for 3mu chains (ATR-26945)
This MR fix ATR-26945 issue for BLS slice.
Affected chains are:
- 'HLT_2mu6_mu4_bUpsi_L12MU5VF_3MU3V'
- 'HLT_mu6_2mu4_bJpsi_L1MU5VF_3MU3V'
- 'HLT_mu6_2mu4_bUpsi_L1MU5VF_3MU3V'
- 'HLT_mu6_2mu4_bDimu2700_L1MU5VF_3MU3V'
- 'HLT_mu6_2mu4_bDimu6000_L1MU5VF_3MU3V'
- 'HLT_mu6_2mu4_bJpsi_L1MU5VF_3MU3VF'
- 'HLT_mu6_2mu4_bUpsi_L1MU5VF_3MU3VF'
- 'HLT_mu6_2mu4_bDimu2700_L1MU5VF_3MU3VF'
- 'HLT_mu6_2mu4_bDimu6000_L1MU5VF_3MU3VF'
Edited by Vladimir Lyubushkin