zerver/lib/test_helpers.py: Fix string annotations.
zerver/lib/test_helpers.py: Fix string annotations.

TigorC/zulip,joyhchen/zulip,blaze225/zulip,jrowan/zulip,Jianchun1/zulip,AZtheAsian/zulip,amyliu345/zulip,ahmadassaf/zulip,samatdav/zulip,ryanbackman/zulip,dhcrzf/zulip,brockwhittaker/zulip,susansls/zulip,umkay/zulip,jphilipsen05/zulip,vikas-parashar/zulip,zulip/zulip,sonali0901/zulip,dawran6/zulip,peguin40/zulip,ahmadassaf/zulip,andersk/zulip,isht3/zulip,punchagan/zulip,zacps/zulip,grave-w-grave/zulip,Juanvulcano/zulip,AZtheAsian/zulip,Jianchun1/zulip,JPJPJPOPOP/zulip,dawran6/zulip,jrowan/zulip,Galexrt/zulip,vabs22/zulip,rishig/zulip,PhilSk/zulip,rishig/zulip,eeshangarg/zulip,cosmicAsymmetry/zulip,AZtheAsian/zulip,brainwane/zulip,paxapy/zulip,reyha/zulip,rht/zulip,mohsenSy/zulip,timabbott/zulip,calvinleenyc/zulip,vabs22/zulip,paxapy/zulip,jrowan/zulip,zacps/zulip,rht/zulip,aakash-cr7/zulip,amanharitsh123/zulip,mohsenSy/zulip,brainwane/zulip,rht/zulip,showell/zulip,vabs22/zulip,samatdav/zulip,tommyip/zulip,dattatreya303/zulip,blaze225/zulip,cosmicAsymmetry/zulip,souravbadami/zulip,arpith/zulip,j831/zulip,ryanbackman/zulip,Galexrt/zulip,umkay/zulip,dattatreya303/zulip,brockwhittaker/zulip,joyhchen/zulip,showell/zulip,mahim97/zulip,reyha/zulip,krtkmj/zulip,JPJPJPOPOP/zulip,souravbadami/zulip,ahmadassaf/zulip,susansls/zulip,calvinleenyc/zulip,zacps/zulip,sonali0901/zulip,verma-varsha/zulip,blaze225/zulip,shubhamdhama/zulip,SmartPeople/zulip,tommyip/zulip,dhcrzf/zulip,kou/zulip,grave-w-grave/zulip,dhcrzf/zulip,hackerkid/zulip,krtkmj/zulip,synicalsyntax/zulip,vikas-parashar/zulip,PhilSk/zulip,susansls/zulip,isht3/zulip,TigorC/zulip,sup95/zulip,ryanbackman/zulip,isht3/zulip,rishig/zulip,KingxBanana/zulip,vabs22/zulip,paxapy/zulip,JPJPJPOPOP/zulip,andersk/zulip,eeshangarg/zulip,umkay/zulip,isht3/zulip,KingxBanana/zulip,niftynei/zulip,synicalsyntax/zulip,mahim97/zulip,andersk/zulip,vaidap/zulip,aakash-cr7/zulip,verma-varsha/zulip,showell/zulip,sonali0901/zulip,arpith/zulip,rht/zulip,hackerkid/zulip,brainwane/zulip,calvinleenyc/zulip,brockwhittaker/zulip,KingxBanana/zulip,vaidap/zulip,andersk/zulip,samatdav/zulip,souravbadami/zulip,blaze225/zulip,vaidap/zulip,shubhamdhama/zulip,cosmicAsymmetry/zulip,zulip/zulip,tommyip/zulip,zulip/zulip,dawran6/zulip,punchagan/zulip,jackrzhang/zulip,synicalsyntax/zulip,ahmadassaf/zulip,jackrzhang/zulip,sup95/zulip,niftynei/zulip,umkay/zulip,vikas-parashar/zulip,dawran6/zulip,punchagan/zulip,krtkmj/zulip,cosmicAsymmetry/zulip,synicalsyntax/zulip,zulip/zulip,rishig/zulip,arpith/zulip,hackerkid/zulip,verma-varsha/zulip,vaidap/zulip,amyliu345/zulip,timabbott/zulip,brainwane/zulip,peguin40/zulip,andersk/zulip,peguin40/zulip,grave-w-grave/zulip,krtkmj/zulip,zulip/zulip,niftynei/zulip,grave-w-grave/zulip,jrowan/zulip,sonali0901/zulip,sharmaeklavya2/zulip,tommyip/zulip,showell/zulip,hackerkid/zulip,Juanvulcano/zulip,calvinleenyc/zulip,reyha/zulip,andersk/zulip,blaze225/zulip,souravbadami/zulip,paxapy/zulip,Jianchun1/zulip,brockwhittaker/zulip,jainayush975/zulip,niftynei/zulip,amyliu345/zulip,ahmadassaf/zulip,paxapy/zulip,aakash-cr7/zulip,PhilSk/zulip,jphilipsen05/zulip,sup95/zulip,PhilSk/zulip,synicalsyntax/zulip,souravbadami/zulip,PhilSk/zulip,amyliu345/zulip,christi3k/zulip,rht/zulip,samatdav/zulip,dhcrzf/zulip,eeshangarg/zulip,reyha/zulip,Galexrt/zulip,sup95/zulip,ahmadassaf/zulip,dawran6/zulip,amanharitsh123/zulip,krtkmj/zulip,dattatreya303/zulip,jainayush975/zulip,joyhchen/zulip,JPJPJPOPOP/zulip,jainayush975/zulip,krtkmj/zulip,TigorC/zulip,Diptanshu8/zulip,sharmaeklavya2/zulip,ryanbackman/zulip,Galexrt/zulip,brainwane/zulip,j831/zulip,showell/zulip,jackrzhang/zulip,joyhchen/zulip,JPJPJPOPOP/zulip,amanharitsh123/zulip,rht/zulip,amanharitsh123/zulip,aakash-cr7/zulip,verma-varsha/zulip,TigorC/zulip,TigorC/zulip,dattatreya303/zulip,kou/zulip,sup95/zulip,Juanvulcano/zulip,kou/zulip,sonali0901/zulip,christi3k/zulip,Diptanshu8/zulip,brainwane/zulip,jainayush975/zulip,vabs22/zulip,showell/zulip,zacps/zulip,shubhamdhama/zulip,Galexrt/zulip,SmartPeople/zulip,tommyip/zulip,christi3k/zulip,Jianchun1/zulip,Diptanshu8/zulip,zacps/zulip,arpith/zulip,ryanbackman/zulip,shubhamdhama/zulip,timabbott/zulip,paxapy/zulip,rht/zulip,timabbott/zulip,Diptanshu8/zulip,calvinleenyc/zulip,reyha/zulip,susansls/zulip,peguin40/zulip,verma-varsha/zulip,susansls/zulip,grave-w-grave/zulip,amanharitsh123/zulip,aakash-cr7/zulip,jrowan/zulip,Diptanshu8/zulip,joyhchen/zulip,zulip/zulip,dawran6/zulip,sharmaeklavya2/zulip,jphilipsen05/zulip,punchagan/zulip,calvinleenyc/zulip,j831/zulip,ahmadassaf/zulip,rishig/zulip,peguin40/zulip,timabbott/zulip,hackerkid/zulip,dattatreya303/zulip,jrowan/zulip,Juanvulcano/zulip,j831/zulip,punchagan/zulip,verma-varsha/zulip,cosmicAsymmetry/zulip,eeshangarg/zulip,christi3k/zulip,mahim97/zulip,jphilipsen05/zulip,KingxBanana/zulip,jphilipsen05/zulip,sharmaeklavya2/zulip,christi3k/zulip,cosmicAsymmetry/zulip,andersk/zulip,tommyip/zulip,rishig/zulip,eeshangarg/zulip,mahim97/zulip,dhcrzf/zulip,brainwane/zulip,ryanbackman/zulip,jackrzhang/zulip,grave-w-grave/zulip,Jianchun1/zulip,KingxBanana/zulip,peg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