Update pr_validation.yml

Author: ccassise

.github/workflows/pr_validation.yml

@@ -125,7 +125,6 @@ jobs:
       run: |
         git clone https://github.com/microsoft/vcpkg.git
         .\vcpkg\bootstrap-vcpkg.bat
-        .\vcpkg\vcpkg.exe install
 
     - name: Configure CMake
       run: >
@@ -144,4 +143,4 @@ jobs:
 
     - name: Test
       working-directory: ${{ steps.strings.outputs.build-output-dir }}
-      run: ctest --build-config ${{ matrix.build_type }}
+      run: ctest --build-config ${{ matrix.build_type }} --rerun-failed --output-on-failure