Fix displaying blocked issues on the board

What does this MR do?

On issue boards when there is a blocked issue we display an icon next to it.

The problem we have now is that we display that icon even when the blocking issue has already been closed. This MR fixes this behavior and displays the icon only when there is an opened blocking issue.

There was no fix needed on the frontend, we only need to return correct data on backend

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.

Issue: #207087 (closed)