fix(ci): test failures should fail the build (#3019)

The 'Check if tests exist' step was actually running tests with
continue-on-error: true. If tests failed, it would set has-tests=false
and skip the actual test step, making CI appear green even with failing tests.

Simplified to use 'npm test --if-present' which:
- Runs tests if a test script exists (and fails if tests fail)
- Does nothing and exits 0 if no test script exists
- Removes the need for the complex check logic

Fixes the issue where PR #3014 had failing tests but CI was green.

.github/workflows/typescript.yml

@@ -41,21 +41,9 @@ jobs:
         working-directory: src/${{ matrix.package }}
         run: npm ci
 
-      - name: Check if tests exist
-        id: check-tests
-        working-directory: src/${{ matrix.package }}
-        run: |
-          if npm run test --silent 2>/dev/null; then
-            echo "has-tests=true" >> $GITHUB_OUTPUT
-          else
-            echo "has-tests=false" >> $GITHUB_OUTPUT
-          fi
-        continue-on-error: true
-
       - name: Run tests
-        if: steps.check-tests.outputs.has-tests == 'true'
         working-directory: src/${{ matrix.package }}
-        run: npm test
+        run: npm test --if-present
 
   build:
     needs: [detect-packages, test]