[INTERNAL] CI: Fixes reverts to public emulator from internal emulator (#4895)

[INTERNAL] CI: Fixes reverts to public emulator from internal emulator

Author: kirankumarkolli

templates/emulator-setup.yml

@@ -2,8 +2,8 @@
 
 steps:
   - pwsh: |
-      Write-Host "Downloading Cosmos Emulator - https://aka.ms/cosmosdbemulator-internal" -ForegroundColor green 
-      Invoke-WebRequest https://aka.ms/cosmosdbemulator-internal -OutFile "$env:temp\azure-cosmosdb-emulator.msi"
+      Write-Host "Downloading Cosmos Emulator - $env:EMULATORMSIURL" -ForegroundColor green 
+      Invoke-WebRequest "$env:EMULATORMSIURL" -OutFile "$env:temp\azure-cosmosdb-emulator.msi"
       Write-Host "Finished Downloading Cosmos Emulator - $env:temp\azure-cosmosdb-emulator.msi" -ForegroundColor green 
       dir "$env:temp"