購入フロー(ゲスト)のE2Eテストを追加

[nanasess]

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[codecov-commenter]

Codecov Report

Merging #521 (11b32e3) into master (4b76107) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #521   +/-   ##
=======================================
  Coverage   54.40%   54.40%           
=======================================
  Files          76       76           
  Lines        9039     9039           
=======================================
  Hits         4918     4918           
  Misses       4121     4121           

Flag	Coverage Δ
tests	54.40% <ø> (ø)

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[nanasess]

• E2Eテストのエラーは macOS で Playwright がエラーになるのを修正 #518 にて対応
• PHPStan のテストは PHPStan のエラー修正 #522 にて対応