fix(fe): prevent course delete modal from opening without selection

[HajunPark-skku]

Description

• course 테이블에서 선택된 row가 없을 때 삭제 확인 모달이 열리지 않도록 수정했습니다.
• 선택된 항목이 없을 때 기존 에러 토스트는 그대로 유지했습니다.

Changes

• 선택된 row 없이 삭제 버튼을 클릭한 경우 event.preventDefault()를 호출하도록 수정했습니다.
• 이를 통해 AlertModal의 trigger 동작으로 인해 삭제 확인 모달이 열리는 문제를 방지했습니다.

---

Tests

• course를 선택하지 않은 상태에서 삭제 버튼을 클릭했습니다.
  • 에러 토스트가 정상적으로 표시됩니다.
  • 삭제 확인 모달은 열리지 않습니다.
• course를 선택한 뒤 삭제 버튼을 클릭했습니다.
  • 삭제 확인 모달이 정상적으로 열립니다.

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.

Closes TAS-2762

[gemini-code-assist]

Code Review

This pull request updates the DataTableDeleteButton component to accept a mouse event in handleDeleteButtonClick and call event.preventDefault() when no rows are selected. The reviewer identified a bug where the delete confirmation modal opens prematurely during asynchronous checks when getCanDelete is provided. They suggested calling event.preventDefault() synchronously when getCanDelete is present to prevent this behavior.

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