feat: Update Go test workflow to use coverage script and include additional package in coverage exclusion

.github/workflows/codecov-upload.yml

@@ -26,19 +26,19 @@ jobs:
           go-version: '1.25.5'
           cache-dependency-path: backend/go.sum
 
-      - name: Run Go tests
-        working-directory: backend
+      - name: Run Go tests with coverage
+        working-directory: ${{ github.workspace }}
         env:
           CGO_ENABLED: 1
         run: |
-          go test -race -v -coverprofile=coverage.out ./... 2>&1 | tee test-output.txt
+          bash scripts/go-test-coverage.sh 2>&1 | tee backend/test-output.txt
           exit ${PIPESTATUS[0]}
 
       - name: Upload backend coverage to Codecov
         uses: codecov/codecov-action@5a1091511ad55cbe89839c7260b706298ca349f7 # v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
-          files: ./backend/coverage.out
+          files: ./backend/coverage.txt
           flags: backend
           fail_ci_if_error: true