Consequences of $b\, \to\, s\, μ^+\, μ^-$ anomalies on $B \, \to \, K^{(*)} \,ν\, \barν$, $B_s \to\, (η,η') \, ν\,\barν$ and $B_s \, \to \, φ\, ν\, \barν$ decay observables