Remove PowerShell daily from CI

This CI has to test the extension, not the daily build. We shouldn't
conflate the two.

Author: andyleejordan

.vsts-ci/templates/ci-general.yml

@@ -1,19 +1,4 @@
 steps:
-  # Setup
-  - powershell: |
-      Write-Host "Installing PowerShell Daily..."
-
-      # Use `AGENT_TEMPDIRECTORY` to make sure the downloaded PowerShell is cleaned up.
-      $powerShellPath = Join-Path -Path $env:AGENT_TEMPDIRECTORY -ChildPath 'powershell'
-      Invoke-WebRequest -Uri https://aka.ms/install-powershell.ps1 -OutFile ./install-powershell.ps1
-
-      ./install-powershell.ps1 -Destination $powerShellPath -Daily
-
-      # Using `prependpath` to update the PATH just for this build.
-      Write-Host "##vso[task.prependpath]$powerShellPath"
-    continueOnError: true
-    displayName: Install PowerShell Daily
-
   - pwsh: '$PSVersionTable'
   displayName: PowerShell version