feat(be): implement search in contest overall apis

[Jaehyeon1020]

Description

Closes TAS-898

• Admin Contest Overall 페이지에서 유저의 realName으로 검색하는 기능
• All Submissions 페이지에서 Contest에 속한 문제로 필터링하는 기능

을 구현합니다.

Additional context

---

Before submitting the PR, please make sure you do the following

• [ ] Read the Contributing Guidelines
• [ ] Read the Contributing Guidelines and follow the Commit Convention
• [ ] Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• [ ] Ideally, include relevant tests that fail without this PR but pass with it.

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
codedang	✅ Ready (Inspect)	Visit Preview	Sep 15, 2024 7:51am

[coolify-skkuding[bot]]

The preview deployment is ready. 🟢

Open Preview | Open Build Logs

Last updated at: 2024-09-15 07:46:47 CET