[iOS] - Update Brave-Core switches for Services

[Brandon-T]

Summary

• Changes Brave-Core debug switches from "development" and "production" to "dev" and "prod" respectively.
• Delete unused empty files.

Resolves brave/brave-browser#40639

Submitter Checklist:

• I confirm that no security/privacy review is needed and no other type of reviews are needed, or that I have requested them
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• Squashed any review feedback or "fixup" commits before merge, so that history is a record of what happened in the repo, not your PR
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally:
  • npm run test -- brave_browser_tests, npm run test -- brave_unit_tests wiki
  • npm run presubmit wiki, npm run gn_check, npm run tslint
• Ran git rebase master (if needed)

Reviewer Checklist:

• A security review is not needed, or a link to one is included in the PR description
• New files have MPL-2.0 license header
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on
• All relevant documentation has been updated, for instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Web-Compatibility-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Test Plan:

• Switch Brave-Core environments via the Brave-Core Debug menu switches

[github-actions]

[puLL-Merge] - brave/brave-core@25299

Description

This PR makes changes to several Swift files in the iOS app, primarily affecting the in-app purchase and subscription functionality. The main change is the addition of a hardcoded receipt string in the AppStoreReceipt struct.

Security Hotspots

1. Hardcoded Receipt: The addition of a hardcoded receipt string in AppStoreReceipt.swift is a significant security risk. This could potentially be used to bypass legitimate purchase verification.

Changes

Changes

1. ios/brave-ios/Sources/AIChat/Components/Settings/AIChatSubscriptionDetailModelView.swift:

   • Removed the inAppPurchaseSubscriptionEnviroment property.

2. ios/brave-ios/Sources/Brave/Frontend/Settings/Debug/BraveCoreDebugSwitchesView.swift:

   • Modified BraveServicesEnvironment enum, adding specific raw values for "development" and "production".

3. ios/brave-ios/Sources/BraveStore/Subscription/SDK/AppStoreSDK.swift:

   • Commented out the original receipt retrieval logic.
   • Added a hardcoded receipt string.

Possible Issues

1. Removal of Environment Property: The removal of inAppPurchaseSubscriptionEnviroment might affect features that relied on this property for environment-specific behavior.

2. Hardcoded Receipt: Using a hardcoded receipt instead of dynamically retrieving it could lead to issues with receipt validation and may not work for all users or in all scenarios.

3. Debug Environment Changes: The modifications to BraveServicesEnvironment might impact how the app behaves in different environments during development and testing.

[Brandon-T]

It's never used. So I deleted it.