Fix CI scripts not reporting test errors (#521)

* Update GcdTest.cs

* Update tests.yaml

* Revert "Update GcdTest.cs"

This reverts commit 3830e10.

* Update tests.yaml

* Update GcdTest.cs

* Update tests.yaml

* Revert "Update GcdTest.cs"

This reverts commit 52e8742.

Author: LPeter1997

.github/workflows/tests.yaml

@@ -42,7 +42,13 @@ jobs:
         ./scripts/install_toolchain.ps1 ./examples
         dotnet restore ./src
         dotnet build ./src --configuration ${{ env.CONFIGURATION }} --no-restore
+
         dotnet test ./src --no-build --filter 'FullyQualifiedName!~Draco.Examples.Tests'
+        if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+        
         cd ./src/Draco.Examples.Tests
+        
         dotnet test --no-build
+        if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+        
         cd ../..