refactor(utils): remove unused utils

[sungik-choi]

Self Checklist

• I wrote a PR title in English and added an appropriate label to the PR.
• I wrote the commit message in English and to follow the Conventional Commits specification.
• I added the changeset about the changes that needed to be released. (or didn't have to)
• I wrote or updated documentation related to the changes. (or didn't have to)
• I wrote or updated tests related to the changes. (or didn't have to)
• I tested the changes in various browsers. (or didn't have to)
  • Windows: Chrome, Edge, (Optional) Firefox
  • macOS: Chrome, Edge, Safari, (Optional) Firefox

Summary

• 사용하지 않는 유틸 함수들을 제거합니다.
• 마이너: tsconfig build 잘못된 경로 수정

Details

• mergeClassName 함수는 classnames로 대체합니다.

Breaking change? (Yes/No)

No

[changeset-bot]

⚠️ No Changeset found

Latest commit: 59f688b

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[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a1dafd8) 86.92% compared to head (59f688b) 87.12%.
Report is 1 commits behind head on alpha.

Additional details and impacted files

@@            Coverage Diff             @@
##            alpha    #1797      +/-   ##
==========================================
+ Coverage   86.92%   87.12%   +0.20%     
==========================================
  Files         277      277              
  Lines        3831     3798      -33     
  Branches      802      794       -8     
==========================================
- Hits         3330     3309      -21     
+ Misses        428      416      -12     
  Partials       73       73              

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