fix(ci): set fail_ci_if_error to true for consistency

Match pr-tests.yml behavior where Codecov upload failures
will fail the workflow.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: JasonXuDeveloper - 傑 <jason@xgamedev.net>

Author: JasonXuDeveloper

.github/workflows/release.yml

@@ -188,7 +188,7 @@ jobs:
           files: coverage/**/TestCoverageResults*.xml
           flags: util
           name: jengine-util
-          fail_ci_if_error: false
+          fail_ci_if_error: true
           verbose: true
 
       - name: Upload coverage to Codecov (ui package)
@@ -198,7 +198,7 @@ jobs:
           files: coverage/**/TestCoverageResults*.xml
           flags: ui
           name: jengine-ui
-          fail_ci_if_error: false
+          fail_ci_if_error: true
           verbose: true
 
   prepare-release: