Detect failures in multiline PowerShell commands

GitLab inserts a check for failure after each command in our `script`.
This is documented here https://docs.gitlab.com/runner/shells/#powershell

However, it doesn't detect failures if we run commands back to back.

This adds the checks GitLab would have added for us if we were able to make it do that.

.gitlab-ci.yml

@@ -632,12 +632,16 @@ macOS14_Xcode15_arm64:
     - |
       if (Get-ChildItem -Recurse *.pdb) {
         7z a -tzip "..\..\$(Make-SafeFileName("OpenMW_MSVC2022_64_${config}_${CI_COMMIT_REF_NAME}_${CI_JOB_ID}_symbols.zip"))" '*.pdb' CI-ID.txt
+        if(!$?) { Exit $LASTEXITCODE }
         if (Test-Path env:AWS_ACCESS_KEY_ID) {
           aws --endpoint-url https://rgw.ctrl-c.liu.se s3 cp "..\..\$(Make-SafeFileName("OpenMW_MSVC2022_64_${config}_${CI_COMMIT_REF_NAME}_${CI_JOB_ID}_symbols.zip"))" s3://openmw-artifacts/${artifactDirectory}
+          if(!$?) { Exit $LASTEXITCODE }
         }
         Push-Location ..
         ..\CI\Store-Symbols.ps1 -SkipCompress
+        if(!$?) { Exit $LASTEXITCODE }
         7z a -tzip "..\$(Make-SafeFileName("OpenMW_MSVC2022_64_${config}_${CI_COMMIT_REF_NAME}_${CI_JOB_ID}_sym_store.zip"))" '.\SymStore\*' $config\CI-ID.txt
+        if(!$?) { Exit $LASTEXITCODE }
         Pop-Location
         Get-ChildItem -Recurse *.pdb | Remove-Item
       }
@@ -645,8 +649,15 @@ macOS14_Xcode15_arm64:
     - |
       if (Test-Path env:AWS_ACCESS_KEY_ID) {
         aws --endpoint-url https://rgw.ctrl-c.liu.se s3 cp "..\..\$(Make-SafeFileName("OpenMW_MSVC2022_64_${config}_${CI_COMMIT_REF_NAME}.zip"))" s3://openmw-artifacts/${artifactDirectory}
+        if(!$?) { Exit $LASTEXITCODE }
+      }
+    - |
+      if ($executables) {
+        foreach ($exe in $executables.Split(',')) {
+          & .\$exe
+          if(!$?) { Exit $LASTEXITCODE }
+        }
       }
-    - if ($executables) { foreach ($exe in $executables.Split(',')) { & .\$exe } }
   after_script:
     - Get-Volume
     - Copy-Item C:\ProgramData\chocolatey\logs\chocolatey.log
@@ -779,12 +790,16 @@ macOS14_Xcode15_arm64:
     - |
       if (Get-ChildItem -Recurse *.pdb) {
         7z a -tzip "..\..\$(Make-SafeFileName("OpenMW_MSVC2022_64_${config}_${CI_COMMIT_REF_NAME}_${CI_JOB_ID}_symbols.zip"))" '*.pdb' CI-ID.txt
+        if(!$?) { Exit $LASTEXITCODE }
         if (Test-Path env:AWS_ACCESS_KEY_ID) {
           aws --endpoint-url https://rgw.ctrl-c.liu.se s3 cp "..\..\$(Make-SafeFileName("OpenMW_MSVC2022_64_${config}_${CI_COMMIT_REF_NAME}_${CI_JOB_ID}_symbols.zip"))" s3://openmw-artifacts/${artifactDirectory}
+          if(!$?) { Exit $LASTEXITCODE }
         }
         Push-Location ..
         ..\CI\Store-Symbols.ps1 -SkipCompress
+        if(!$?) { Exit $LASTEXITCODE }
         7z a -tzip "..\$(Make-SafeFileName("OpenMW_MSVC2022_64_${config}_${CI_COMMIT_REF_NAME}_${CI_JOB_ID}_sym_store.zip"))" '.\SymStore\*' $config\CI-ID.txt
+        if(!$?) { Exit $LASTEXITCODE }
         Pop-Location
         Get-ChildItem -Recurse *.pdb | Remove-Item
       }
@@ -792,8 +807,15 @@ macOS14_Xcode15_arm64:
     - |
       if (Test-Path env:AWS_ACCESS_KEY_ID) {
         aws --endpoint-url https://rgw.ctrl-c.liu.se s3 cp "..\..\$(Make-SafeFileName("OpenMW_MSVC2022_64_${config}_${CI_COMMIT_REF_NAME}.zip"))" s3://openmw-artifacts/${artifactDirectory}
+        if(!$?) { Exit $LASTEXITCODE }
+      }
+    - |
+      if ($executables) {
+        foreach ($exe in $executables.Split(',')) {
+          & .\$exe
+          if(!$?) { Exit $LASTEXITCODE }
+        }
       }
-    - if ($executables) { foreach ($exe in $executables.Split(',')) { & .\$exe } }
   after_script:
     - Get-Volume
     - Copy-Item C:\ProgramData\chocolatey\logs\chocolatey.log