fix: set test results upload to fail CI on error

Add fail_ci_if_error: true to test results upload step to ensure CI fails when codecov upload fails, matching the coverage upload configuration.

Author: devin-ai-integration[bot]

.github/workflows/build.yml

@@ -68,6 +68,7 @@ jobs:
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: coverage/pytest-results.xml,coverage/junit.xml
+          fail_ci_if_error: true
 
       - name: Package the extension
         run: |