Tidy up CI test changes.

Perserve try-catch logic since that seems to have worked well. The TestResults directory is no longer needed.

.github/actions/Test/action.yml

@@ -16,5 +16,12 @@ runs:
     run: |
       $runTestCmd = "${{ inputs.target-path }} ${{ inputs.target-args }}"
       ECHO Invoking... $runTestCmd
-      Invoke-Expression $runTestCmd
+      # Wrap the invokation so that we can act on its success or failure
+      try {
+        Invoke-Expression $runTestCmd
+      } catch {
+        # seems to have failed
+        ECHO "::error::Tests failed - " + $_.Exception.Message
+        EXIT 1
+      }
     shell: pwsh

.github/workflows/ContinuousIntegration.yml

@@ -91,8 +91,6 @@ jobs:
     # Perform unit testing
     - name: Add VSTest.console.exe to PATH
       uses: darenm/Setup-VSTest@d9a5dffa3f11d9c27ec42eb69515d3aaeaad9ef8
-    - name: Make a TestResults directory
-      run: mkdir -p ./TestResults
     - name: Test our solution
       uses: ./.github/actions/Test
       with: