Extract admin.set_up_deactivate_user_modal().
Extract admin.set_up_deactivate_user_modal().

This sets us up to eliminate the "active_user_row" hacks in
our next commit.

brockwhittaker/zulip,brockwhittaker/zulip,vaidap/zulip,PhilSk/zulip,calvinleenyc/zulip,dhcrzf/zulip,AZtheAsian/zulip,tommyip/zulip,vabs22/zulip,jackrzhang/zulip,amanharitsh123/zulip,vabs22/zulip,grave-w-grave/zulip,samatdav/zulip,dawran6/zulip,jrowan/zulip,isht3/zulip,samatdav/zulip,showell/zulip,mahim97/zulip,andersk/zulip,rishig/zulip,amyliu345/zulip,joyhchen/zulip,niftynei/zulip,Jianchun1/zulip,isht3/zulip,sonali0901/zulip,jphilipsen05/zulip,dattatreya303/zulip,kou/zulip,timabbott/zulip,peguin40/zulip,amanharitsh123/zulip,showell/zulip,joyhchen/zulip,eeshangarg/zulip,JPJPJPOPOP/zulip,aakash-cr7/zulip,souravbadami/zulip,souravbadami/zulip,SmartPeople/zulip,cosmicAsymmetry/zulip,samatdav/zulip,niftynei/zulip,synicalsyntax/zulip,susansls/zulip,showell/zulip,amyliu345/zulip,jainayush975/zulip,brainwane/zulip,jrowan/zulip,peguin40/zulip,jainayush975/zulip,souravbadami/zulip,hackerkid/zulip,verma-varsha/zulip,shubhamdhama/zulip,kou/zulip,kou/zulip,TigorC/zulip,peguin40/zulip,reyha/zulip,mahim97/zulip,Diptanshu8/zulip,j831/zulip,kou/zulip,AZtheAsian/zulip,dattatreya303/zulip,andersk/zulip,jainayush975/zulip,tommyip/zulip,sonali0901/zulip,vabs22/zulip,zulip/zulip,vaidap/zulip,grave-w-grave/zulip,zulip/zulip,Jianchun1/zulip,Jianchun1/zulip,eeshangarg/zulip,AZtheAsian/zulip,brockwhittaker/zulip,sonali0901/zulip,TigorC/zulip,aakash-cr7/zulip,ryanbackman/zulip,tommyip/zulip,Diptanshu8/zulip,synicalsyntax/zulip,TigorC/zulip,vikas-parashar/zulip,jackrzhang/zulip,Jianchun1/zulip,vaidap/zulip,TigorC/zulip,verma-varsha/zulip,KingxBanana/zulip,amyliu345/zulip,Galexrt/zulip,sonali0901/zulip,isht3/zulip,andersk/zulip,KingxBanana/zulip,rishig/zulip,KingxBanana/zulip,samatdav/zulip,Galexrt/zulip,joyhchen/zulip,calvinleenyc/zulip,cosmicAsymmetry/zulip,andersk/zulip,peguin40/zulip,vaidap/zulip,sharmaeklavya2/zulip,mahim97/zulip,eeshangarg/zulip,blaze225/zulip,rishig/zulip,hackerkid/zulip,verma-varsha/zulip,joyhchen/zulip,isht3/zulip,zacps/zulip,hackerkid/zulip,Galexrt/zulip,dattatreya303/zulip,samatdav/zulip,calvinleenyc/zulip,brockwhittaker/zulip,jrowan/zulip,ryanbackman/zulip,rishig/zulip,eeshangarg/zulip,reyha/zulip,rht/zulip,dawran6/zulip,arpith/zulip,jackrzhang/zulip,Juanvulcano/zulip,blaze225/zulip,grave-w-grave/zulip,arpith/zulip,amyliu345/zulip,jphilipsen05/zulip,SmartPeople/zulip,j831/zulip,mahim97/zulip,Diptanshu8/zulip,zulip/zulip,hackerkid/zulip,rht/zulip,punchagan/zulip,KingxBanana/zulip,zacps/zulip,cosmicAsymmetry/zulip,brainwane/zulip,shubhamdhama/zulip,tommyip/zulip,Galexrt/zulip,dawran6/zulip,JPJPJPOPOP/zulip,sonali0901/zulip,dawran6/zulip,synicalsyntax/zulip,joyhchen/zulip,dawran6/zulip,Juanvulcano/zulip,punchagan/zulip,joyhchen/zulip,ryanbackman/zulip,niftynei/zulip,reyha/zulip,punchagan/zulip,vikas-parashar/zulip,j831/zulip,showell/zulip,jphilipsen05/zulip,PhilSk/zulip,Juanvulcano/zulip,jackrzhang/zulip,calvinleenyc/zulip,timabbott/zulip,niftynei/zulip,kou/zulip,arpith/zulip,cosmicAsymmetry/zulip,timabbott/zulip,shubhamdhama/zulip,christi3k/zulip,rht/zulip,blaze225/zulip,grave-w-grave/zulip,tommyip/zulip,arpith/zulip,grave-w-grave/zulip,ryanbackman/zulip,Galexrt/zulip,andersk/zulip,timabbott/zulip,timabbott/zulip,rishig/zulip,punchagan/zulip,susansls/zulip,jrowan/zulip,sharmaeklavya2/zulip,dhcrzf/zulip,ryanbackman/zulip,vikas-parashar/zulip,dhcrzf/zulip,christi3k/zulip,Diptanshu8/zulip,reyha/zulip,Diptanshu8/zulip,amyliu345/zulip,sonali0901/zulip,sharmaeklavya2/zulip,JPJPJPOPOP/zulip,Galexrt/zulip,jphilipsen05/zulip,aakash-cr7/zulip,cosmicAsymmetry/zulip,jphilipsen05/zulip,dattatreya303/zulip,ryanbackman/zulip,kou/zulip,jphilipsen05/zulip,arpith/zulip,kou/zulip,dawran6/zulip,synicalsyntax/zulip,jackrzhang/zulip,JPJPJPOPOP/zulip,mahim97/zulip,punchagan/zulip,synicalsyntax/zulip,vikas-parashar/zulip,showell/zulip,rishig/zulip,j831/zulip,reyha/zulip,dhcrzf/zulip,aakash-cr7/zulip,showell/zulip,isht3/zulip,verma-varsha/zulip,SmartPeople/zulip,shubhamdhama/zulip,brainwane/zulip,andersk/zulip,christi3k/zulip,Juanvulcano/zulip,synicalsyntax/zulip,souravbadami/zulip,punchagan/zulip,JPJPJPOPOP/zulip,amanharitsh123/zulip,christi3k/zulip,rishig/zulip,samatdav/zulip,SmartPeople/zulip,christi3k/zulip,rht/zulip,zulip/zulip,zacps/zulip,peguin40/zulip,dhcrzf/zulip,aakash-cr7/zulip,Jianchun1/zulip,AZtheAsian/zulip,punchagan/zulip,aakash-cr7/zulip,blaze225/zulip,Jianchun1/zulip,dattatreya303/zulip,JPJPJPOPOP/zulip,brockwhittaker/zulip,hackerkid/zulip,shubhamdhama/zulip,jainayush975/zulip,j831/zulip,peguin40/zulip,zacps/zulip,zacps/zulip,dhcrzf/zulip,rht/zulip,zulip/zulip,TigorC/zulip,zacps/zulip,vabs22/zulip,vikas-parashar/zulip,niftynei/zulip,amanharitsh123/zulip,Juanvulcano/zulip,Galexrt/zulip,dattatreya303/zulip,vabs22/zulip,showell/zulip,Juanvulcano/zulip,rht/zulip,sharmaeklavya2/zulip,zulip/zulip,AZtheAsian/zulip,susansls/zulip,brainwane/zulip,susansls/zulip,eeshangarg/zulip,jackrzhang/zulip,PhilSk/zulip,cosmicAsymmetry/zulip,zulip/zulip,jackrzhang/zulip,synicalsyntax/zulip,KingxBanana/zulip,brockwhittaker/zulip,sharmaeklavya2/zulip,vaidap/zulip,vabs22/zulip,jainayush975/zulip,jrowan/zulip,brainwane/zulip,amanharitsh123/zulip,mahim97/zulip,Diptanshu8/zulip,amyliu345/zulip,niftynei/zulip,isht3/zulip,calvinleenyc/zulip,PhilSk/zulip,shubhamdhama/zulip,amanharitsh123/zulip,blaze225/zulip,eeshangarg/zulip,AZtheAsian/zulip,eeshangarg/zulip,SmartPeople/zulip,shubhamdhama/zulip,hackerkid/zulip,arpith/zulip,KingxBanana/zulip,brainwane/zulip,vaidap/zulip,PhilSk/zulip,jrowan/zulip,souravbadami/zulip,PhilSk/zulip,jainayush975/zulip,vikas-parashar/zulip,verma-varsha/zulip,hackerkid/zulip,grave-w-grave/zulip,blaze225/zulip,dhcrzf/zulip,timabbott/zulip,brainwane/zulip,andersk/zulip,SmartPeople/zulip,reyha/zulip,christi3k/zulip,tommyip/zulip,susansls/zulip,TigorC/zulip,susansls/zulip,sharmaeklavya2/zulip,calvinleenyc/zulip,souravbadami/zulip,tommyip/zulip,timabbott/zulip,verma-varsha/zulip,j831/zulip,rht/zulip