Is it necessary to use GFCI receptacle with AFCI/GFCI combo breaker?
If you have a circuit where you need both AFCI and GFCI protection for some reason, yes, these breakers are fine to use, and no, you do not need additional GFI receptacles. That would be redundant and waste $$$.

Yes, you definitely would need to go to the breaker panel to reset a tripped breaker. There is no such thing as a "remote reset". 

You also should test them once a month or so.