Merge bitcoin/bitcoin#34583: ci: [refactor] Drop last use of pwsh

fa36adeb71 ci: [refactor] Drop last use of pwsh (MarcoFalke)
fae31b1e2f ci: [refactor] Move github_import_vs_env to python script (MarcoFalke)

Pull request description:

  The use of pwsh was a bit confusing and inconsistent around the exit code. See also https://github.com/bitcoin/bitcoin/pull/32672

  I think it is fine to drop it and purely use Bash/Python.

  This also moves a bit of code from the github yaml to the python script.

ACKs for top commit:
  m3dwards:
    Looks good! re-ACK fa36adeb71
  hodlinator:
    re-ACK fa36adeb71

Tree-SHA512: 78edffc60c58c476b0acca5224150169d154b0b818114844a04295af9ba19b7cdf1fb2afb738f6cafd6172f0f477d546018ebf95061eb5bd8bbb35e065a129d4

.github/workflows/ci.yml

@@ -238,26 +238,19 @@ jobs:
 
       - *CHECKOUT
 
-      - &SET_UP_VS
-        name: Set up VS Developer Prompt
-        shell: pwsh -Command "$PSVersionTable; $PSNativeCommandUseErrorActionPreference = $true; $ErrorActionPreference = 'Stop'; & '{0}'"
-        run: |
-          $vswherePath = "${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe"
-          $installationPath = & $vswherePath -latest -property installationPath
-          & "${env:COMSPEC}" /s /c "`"$installationPath\Common7\Tools\vsdevcmd.bat`" -arch=x64 -no_logo && set" | foreach-object {
-            $name, $value = $_ -split '=', 2
-            echo "$name=$value" >> $env:GITHUB_ENV
-          }
+      - &IMPORT_VS_ENV
+        name: Import Visual Studio env vars
+        run: py -3 .github/ci-windows.py "standard" github_import_vs_env
 
       - name: Get tool information
-        shell: pwsh
         run: |
-          cmake -version | Tee-Object -FilePath "cmake_version"
-          Write-Output "---"
-          msbuild -version | Tee-Object -FilePath "msbuild_version"
-          $env:VCToolsVersion | Tee-Object -FilePath "toolset_version"
+          set -o errexit -o pipefail -o xtrace -o nounset
+
+          cmake -version | tee cmake_version
+          echo '---'
+          msbuild.exe -version | tee msbuild_version
+          echo "${VCToolsVersion-}" | tee toolset_version
           py -3 --version
-          Write-Host "PowerShell version $($PSVersionTable.PSVersion.ToString())"
           bash --version
 
       - name: Using vcpkg with MSBuild
@@ -430,7 +423,7 @@ jobs:
       - name: Run bitcoind.exe
         run: py -3 .github/ci-windows-cross.py print_version
 
-      - *SET_UP_VS
+      - *IMPORT_VS_ENV
 
       - name: Check executable manifests
         run: py -3 .github/ci-windows-cross.py check_manifests