Reverts "[url_launcher] Add Swift Package Manager integration to example app (#8128)" (#8136)

Reverts: flutter/packages#8128
Initiated by: loic-sharma
Reason for reverting: this caused the license checker to [error](https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8730732827684094689/+/u/Run_package_tests/license_validation/stdout):

```
The license block for these files is missing or incorrect:
  /b/s/w/ir/x/w/packages/packages/url_launcher/url_launcher/example/ios/Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage/Package.swift
  /b
Original PR Author: loic-sharma

Reviewed By: {stuartmorgan}

This change reverts the following previous change:
This migrates the example app to have Swift Package Manager integration. This raises the example app's Flutter SDK requirement to 3.24.0 or higher.

Scenarios:

1. **Run the example app using Flutter 3.24 or higher with SwiftPM feature on**: Plugin is added using Swift Package Manager.
2. **Run the example app using Flutter 3.24 or higher with SwiftPM feature off**: Plugin is added using CocoaPods. The tool generates an empty `FlutterGeneratedPluginSwiftPackage` local package.
3. **Run the example app using Flutter version lower than 3.24**: you get a build error because the example app's Xcode project expects a `FlutterGeneratedPluginSwiftPackage` local package but cannot find it.

Part of: https://github.com/flutter/flutter/issues/159173

### Tests

Current tests build the example apps twice: once with SwiftPM on, once with SwiftPM off. 

Currently, the tests with SwiftPM on also migrate the example app to add SwiftPM integration. After this change, these tests will no longer need to migrate the example app as it is already migrated.

In other words, this change is covered by existing tests.

### Migration steps

The app was migrated using these steps:

```console
flutter channel master
flutter upgrade
flutter config --enable-swift-package-manager
flutter build ios --config-only
flutter build macos --config-only
```
5 files changed
tree: 7ef697ff04378c697166896cec12f4251cad6c83
  1. .ci/
  2. .github/
  3. packages/
  4. script/
  5. third_party/
  6. .ci.yaml
  7. .clang-format
  8. .gitattributes
  9. .gitignore
  10. .metadata
  11. analysis_options.yaml
  12. AUTHORS
  13. CODEOWNERS
  14. CONTRIBUTING.md
  15. customer_testing.bat
  16. customer_testing.sh
  17. LICENSE
  18. README.md
README.md

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google_sign_inpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
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quick_actionspub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
google_identity_services_webpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
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two_dimensional_scrollablespub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
url_launcherpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
vector_graphicspub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
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