chore: remove redundant app.config.js support

[DoctorJohn]

Description

This PR removes the redundant and deprecated handling of app.config.js files from the ios_config.sh and build.gradle scripts.

Now that app.config.js support is handled by the Expo config plugin, the ios_config.sh and build.gradle scripts no longer need to consider app.config.js at all. Parts of the code added in #517 can be removed again to make the scripts easier to maintain. That's exactly what this PR does. It's simply reverting all changes to the relevant files from said PR. I double checked that this does only revert the app.config.js support and nothing else (e.g. fixes or other refactorings).

Checklist

• I read the Contributor Guide
  and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
• My change includes tests;
  • e2e tests added or updated in __tests__e2e__
  • jest tests added or updated in __tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

• Ran our tests
• Made sure the example app still works

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.66%. Comparing base (a34c7ba) to head (5f10dd5).
Report is 36 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #606      +/-   ##
==========================================
- Coverage   43.72%   42.66%   -1.06%     
==========================================
  Files          30       31       +1     
  Lines         549      565      +16     
  Branches      151      154       +3     
==========================================
+ Hits          240      241       +1     
- Misses        309      324      +15     

[dylancom]

Good catch👍

[mikehardy]

🎉 This PR is included in version 14.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀