remove duplicate backend migration prompts
remove duplicate backend migration prompts

The duplicate prompts can be confusing when the user confirms that a
migration should happen and we immediately prompt a second time for the
same thing with slightly different wording. The extra hand-holding that
this provides for legacy remote states is less critical now, since it's
been 2 major release cycles since those were removed.

apparentlymart/terraform,lusis/terraform,kjmkznr/terraform,kjmkznr/terraform,svanharmelen/terraform,svanharmelen/terraform,HotelsDotCom/terraform,donaldguy/terraform,pradeepbhadani/terraform,iljaskevic/terraform,VladRassokhin/terraform,donaldguy/terraform,fatmcgav/terraform,fatmcgav/terraform,hartzell/terraform,HotelsDotCom/terraform,justnom/terraform,tommynsong/terraform,ewbankkit/terraform,pdecat/terraform,yanndegat/terraform,drebes/terraform,ewbankkit/terraform,justnom/terraform,ddegoede/terraform,pradeepbhadani/terraform,HotelsDotCom/terraform,tommynsong/terraform,heimweh/terraform,brandontosch/terraform,mattray/terraform,luis-silva/terraform,grasshoppergroup/terraform,HotelsDotCom/terraform,VladRassokhin/terraform,luis-silva/terraform,lusis/terraform,kl4w/terraform,tpounds/terraform,asedge/terraform,kjmkznr/terraform,grasshoppergroup/terraform,nlamirault/terraform,rnaveiras/terraform,heimweh/terraform,ddegoede/terraform,apparentlymart/terraform,iljaskevic/terraform,heimweh/terraform,tpounds/terraform,youhong316/terraform,youhong316/terraform,paultyng/terraform,hashicorp/terraform,lusis/terraform,hartzell/terraform,antonbabenko/terraform,mattray/terraform,HotelsDotCom/terraform,pryorda/terraform,antonbabenko/terraform,brandontosch/terraform,antonbabenko/terraform,lusis/terraform,VladRassokhin/terraform,nlamirault/terraform,ewbankkit/terraform,pryorda/terraform,kl4w/terraform,tpounds/terraform,hartzell/terraform,huydinhle/terraform,paultyng/terraform,paultyng/terraform,justnom/terraform,apparentlymart/terraform,ddegoede/terraform,kl4w/terraform,hashicorp/terraform,iljaskevic/terraform,ddegoede/terraform,kjmkznr/terraform,rnaveiras/terraform,pradeepbhadani/terraform,pryorda/terraform,pdecat/terraform,grasshoppergroup/terraform,donaldguy/terraform,heimweh/terraform,tpounds/terraform,antonbabenko/terraform,mattray/terraform,hashicorp/terraform,gechr/terraform,drebes/terraform,grasshoppergroup/terraform,huydinhle/terraform,huydinhle/terraform,yanndegat/terraform,asedge/terraform,brandontosch/terraform,ewbankkit/terraform,asedge/terraform,nlamirault/terraform,heimweh/terraform,mattray/terraform,fatmcgav/terraform,apparentlymart/terraform,drebes/terraform,justnom/terraform,antonbabenko/terraform,youhong316/terraform,donaldguy/terraform,svanharmelen/terraform,yanndegat/terraform,tommynsong/terraform,VladRassokhin/terraform,luis-silva/terraform,brandontosch/terraform,iljaskevic/terraform,gechr/terraform,hartzell/terraform,apparentlymart/terraform,ddegoede/terraform,paultyng/terraform,svanharmelen/terraform,kl4w/terraform,gechr/terraform,drebes/terraform,brandontosch/terraform,fatmcgav/terraform,huydinhle/terraform,rnaveiras/terraform,pdecat/terraform,asedge/terraform,pdecat/terraform,youhong316/terraform,luis-silva/terraform,yanndegat/terraform