Would the Aeroflot Flight 1492 have been able to dump its fuel first before landing?
This aircraft does not have fuel dumping capability. In general, only large wide body airliners have fuel dumping capability. 

Aircraft can land overweight quite easily but getting stopped on the runway safely is the main problem. 

Even with fuel dumping, aircraft will often still plan to land overweight. The amount of fuel to be dumped would be planned to make a safe landing on the available runway without excessively heating the brakes and tires.