Fix never_subscribed streams being sent for Zephyr mirroring.
Fix never_subscribed streams being sent for Zephyr mirroring.

Because in the Zephyr world, stream names can be a secret, and also
Zephyr mirroring tends to involve many thousands of streams, we
shouldn't send this data.

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