feat: add cross-check review status message

[asfound]

🟢 Add deploy label if you want to deploy this Pull Request to staging environment

🧑‍⚖️ Pull Request Naming Convention

• Title should follow Conventional Commits
• Do not put issue id in title
• Do not put WIP in title. Use Draft PR functionality
• Consider to add area:* label(s)

• I followed naming convention rules

---

🤔 This is a ...

• New feature
• Bug fix
• Performance optimization
• Refactoring
• Test Case
• Documentation update
• Other

🔗 Related issue link

Issue 2553

💡 Background and solution

Background:

When the cross-check starts, in the Cross-Check: Submit tab, in the section where reviewers’ messages appear, there was no clear indication if no one has reviewed the work.

Solution:

1. Added a status image and message: "No one has checked your work yet."
   This is displayed when Cross-check has started, but no reviews have been submitted.

2. Added a status image and message: "No one has checked your work. Check if you are eligible to appeal here."
   This is shown when Cross-check has ended, and no reviews were submitted. The message includes a link to the appeal section of the Cross-check flow in the school documentation.

Test-tasks cases

• Cross-check not started, submit possible: status not shown.

• Cross-check ongoing, review present: status not shown.

• Cross-check ongoing, no review: status shown.

• Cross-check ended, no review: status and link to appeal shown.

• Cross-check ended, no submit: status not shown.

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Database migration is added or not needed
• Documentation is updated/provided or not needed
• Changes are tested locally