refactor: Standardize file existence checks to pathExists

[aklinker1]

Overview

Broken out of #2081.

exists is a generic name compared to pathExists, and I've updated other locations for checking if a file exists to match.

Manual Testing

CI checks pass

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commit: f7dd555

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 75.83%. Comparing base (1fe0730) to head (f7dd555).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...src/core/builders/vite/plugins/resolveAppConfig.ts	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2083      +/-   ##
==========================================
- Coverage   76.03%   75.83%   -0.20%     
==========================================
  Files         113      113              
  Lines        3050     3050              
  Branches      686      686              
==========================================
- Hits         2319     2313       -6     
- Misses        648      652       +4     
- Partials       83       85       +2     

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