プロジェクト名とコンテスト名の重複を禁止して、名前の上限を伸ばした

[Tennessine699]

resolves #703
resolves #712

[codecov]

Codecov Report

Attention: Patch coverage is 27.88462% with 75 lines in your changes missing coverage. Please review.

Project coverage is 72.88%. Comparing base (49b4548) to head (0f5ef59).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/infrastructure/migration/v2.go	4.05%	70 Missing and 1 partial ⚠️
internal/infrastructure/repository/contest_impl.go	80.00%	1 Missing and 1 partial ⚠️
internal/infrastructure/repository/project_impl.go	80.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #723      +/-   ##
==========================================
+ Coverage   72.51%   72.88%   +0.37%     
==========================================
  Files          42       42              
  Lines        3842     3843       +1     
==========================================
+ Hits         2786     2801      +15     
+ Misses        903      886      -17     
- Partials      153      156       +3     

Flag	Coverage Δ
integration	72.88% <27.88%> (+0.37%)	⬆️
unit	72.88% <27.88%> (+0.37%)	⬆️

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[ras0q]

projectの方に投げたreviewはcontestも同様