Synthesis of Ir[μ2‐(N‐N)]M (M = Ir and Ru) Homo‐ and Heterobimetallic Complexes through a Condensation Reaction of N‐Amino and Formyl Groups Bound to Mononuclear (ηn‐CnMen)M Units (n = 5 for M = Ir; n = 6 for M = Ru)