Fix GitHub Actions workflow failures

- Add WP_PHPUNIT__DIR and WP_TESTS_DIR environment variables to PHPUnit workflow to fix 'WP_UnitTestCase not found' error
- Increase WordPress Playground server timeout from 60s to 180s with better progress logging to fix timeout failures
- Add conditional checks for SONAR_TOKEN and CODACY_PROJECT_TOKEN to gracefully skip analysis when tokens are not set
- Properly handle server process lifecycle in Playground tests (capture PID, kill on completion)

.github/workflows/wordpress-tests.yml

@@ -81,13 +81,33 @@ jobs:
 
         # Start WordPress Playground with our blueprint
         npx @wp-playground/cli server --blueprint playground/blueprint.json --port 8888 --login &
+        SERVER_PID=$!
 
-        # Wait for WordPress Playground to be ready
+        # Wait for WordPress Playground to be ready (increased timeout to 180s)
         echo "Waiting for WordPress Playground to be ready..."
-        timeout 60 bash -c 'until curl -s http://localhost:8888; do sleep 2; done'
+        TIMEOUT=180
+        ELAPSED=0
+        while ! curl -s http://localhost:8888 > /dev/null 2>&1; do
+          if [ $ELAPSED -ge $TIMEOUT ]; then
+            echo "Timeout waiting for WordPress Playground to start"
+            kill $SERVER_PID || true
+            exit 1
+          fi
+          echo "Waiting... ($ELAPSED/$TIMEOUT seconds)"
+          sleep 5
+          ELAPSED=$((ELAPSED + 5))
+        done
+        echo "WordPress Playground is ready after $ELAPSED seconds"
 
         # Run tests against WordPress Playground
         npx cypress run --spec "cypress/e2e/playground-single-site.cy.js"
+        TEST_EXIT_CODE=$?
+
+        # Kill the server process
+        kill $SERVER_PID || true
+
+        # Return the test exit code
+        exit $TEST_EXIT_CODE
 
     - name: Upload Cypress artifacts
       if: always()