fix(ci): Prevent bash errexit from failing on counter increment

The `((passed++))` syntax returns 0 (false) when passed=0, which
causes bash -e to exit the script. Use $((passed + 1)) instead
which always succeeds.

Author: markpollack

.github/workflows/integration-tests.yml

@@ -297,10 +297,10 @@ jobs:
 
             if ./integration-testing/scripts/run-integration-tests.sh "$test"; then
               echo "PASSED: $test"
-              ((passed++))
+              passed=$((passed + 1))
             else
               echo "FAILED: $test"
-              ((failed++))
+              failed=$((failed + 1))
               failed_tests="$failed_tests\n  - $test"
             fi