[flutter_tools] Register trackWidgetCreation in AppleBuildOptionsBundle - #196078

Registers `BuildInfoOptions.trackWidgetCreation` in `AppleBuildOptionsBundle` so Apple build subcommands (`build ios`, `build ipa`, and `build macos`) register `--[no-]track-widget-creation` (defaulting to on).

Previously, `AppleBuildOptionsBundle` omitted `trackWidgetCreation`, causing `flutter build ios --debug` to evaluate `trackWidgetCreation` as false in `getBuildInfo()` and emit `TRACK_WIDGET_CREATION=false` in `Generated.xcconfig`. When attaching to the running debug app with `flutter attach`, hot reloads compiled with `--track-widget-creation` resulted in a `Lookup failed: _location` runtime error.

Previous output:
```
00:00 +0: loading /usr/local/google/home/bkonyi/.gemini/jetski/worktrees/flutter/issue-195792/packages/flutter_tools/test/commands.shard/hermetic/build_ios_test.dart
00:00 +0: (setUpAll)
00:00 +0: ios build config-only writes TRACK_WIDGET_CREATION=true to Generated.xcconfig by default
Expected: contains 'TRACK_WIDGET_CREATION=true'
  Actual: '// This is a generated file; do not edit or check into version control.\n'
            'FLUTTER_ROOT=/usr/local/google/home/bkonyi/.gemini/jetski/worktrees/flutter/issue-195792\n'
            'FLUTTER_APPLICATION_PATH=/\n'
            'FLUTTER_FRAMEWORK_SWIFT_PACKAGE_PATH=/ios/Flutter/ephemeral/Packages/.packages/FlutterFramework\n'
            'COCOAPODS_PARALLEL_CODE_SIGN=true\n'
            'FLUTTER_TARGET=lib/main.dart\n'
            'FLUTTER_BUILD_DIR=build\n'
            'FLUTTER_BUILD_NAME=1.0.0\n'
            'FLUTTER_BUILD_NUMBER=1\n'
            'EXCLUDED_ARCHS[sdk=iphonesimulator*]=i386\n'
            'EXCLUDED_ARCHS[sdk=iphoneos*]=armv7\n'
            'DART_DEFINES=RkxVVFRFUl9WRVJTSU9OPTAuMC4w,RkxVVFRFUl9DSEFOTkVMPW1hc3Rlcg==,RkxVVFRFUl9HSVRfVVJMPWh0dHBzOi8vZ2l0aHViLmNvbS9mbHV0dGVyL2ZsdXR0ZXIuZ2l0,RkxVVFRFUl9GUkFNRVdPUktfUkVWSVNJT049MTExMTE=,RkxVVFRFUl9FTkdJTkVfUkVWSVNJT049YWJjZGU=,RkxVVFRFUl9EQVJUX1ZFUlNJT049MTI=\n'
            'DART_OBFUSCATION=false\n'
            'TRACK_WIDGET_CREATION=false\n'
            'TREE_SHAKE_ICONS=true\n'
            'PACKAGE_CONFIG=/.dart_tool/package_config.json\n'
            ''
   Which: does not contain 'TRACK_WIDGET_CREATION=true'
```

Current output:
```
00:00 +0: loading /usr/local/google/home/bkonyi/.gemini/jetski/worktrees/flutter/issue-195792/packages/flutter_tools/test/commands.shard/hermetic/build_ios_test.dart
00:00 +0: (setUpAll)
00:00 +0: ios build config-only writes TRACK_WIDGET_CREATION=true to Generated.xcconfig by default
00:00 +1: (tearDownAll)
00:00 +1: All tests passed!
```

Fixes flutter#195792

Explicitly passes `--debug` in the `build_ios_test.dart` config-only tests for `TRACK_WIDGET_CREATION` since `flutter build ios` defaults to release mode.

Previous output:
```
+13: ios build debug config-only writes TRACK_WIDGET_CREATION=true to Generated.xcconfig by default

Expected: contains 'TRACK_WIDGET_CREATION=true'
  Actual: '// This is a generated file; do not edit or check into version control.\n'
            'FLUTTER_ROOT=/usr/local/google/home/bkonyi/.gemini/jetski/worktrees/flutter/issue-195792\n'
            'FLUTTER_APPLICATION_PATH=/\n'
            'FLUTTER_FRAMEWORK_SWIFT_PACKAGE_PATH=/ios/Flutter/ephemeral/Packages/.packages/FlutterFramework\n'
            'COCOAPODS_PARALLEL_CODE_SIGN=true\n'
            'FLUTTER_TARGET=lib/main.dart\n'
            'FLUTTER_BUILD_DIR=build\n'
            'FLUTTER_BUILD_NAME=1.0.0\n'
            'FLUTTER_BUILD_NUMBER=1\n'
            'EXCLUDED_ARCHS[sdk=iphonesimulator*]=i386\n'
            'EXCLUDED_ARCHS[sdk=iphoneos*]=armv7\n'
            'DART_DEFINES=RkxVVFRFUl9WRVJTSU9OPTAuMC4w,RkxVVFRFUl9DSEFOTkVMPW1hc3Rlcg==,RkxVVFRFUl9HSVRfVVJMPWh0dHBzOi8vZ2l0aHViLmNvbS9mbHV0dGVyL2ZsdXR0ZXIuZ2l0,RkxVVFRFUl9GUkFNRVdPUktfUkVWSVNJT049MTExMTE=,RkxVVFRFUl9FTkdJTkVfUkVWSVNJT049YWJjZGU=,RkxVVFRFUl9EQVJUX1ZFUlNJT049MTI=\n'
            'DART_OBFUSCATION=false\n'
            'TRACK_WIDGET_CREATION=false\n'
            'TREE_SHAKE_ICONS=false\n'
            'PACKAGE_CONFIG=/.dart_tool/package_config.json\n'
            ''
   Which: does not contain 'TRACK_WIDGET_CREATION=true'
```

Current output:
```
00:00 +0: loading /usr/local/google/home/bkonyi/.gemini/jetski/worktrees/flutter/issue-195792/packages/flutter_tools/test/commands.shard/hermetic/build_ios_test.dart
00:00 +0: (setUpAll)
00:00 +0: ios build debug config-only writes TRACK_WIDGET_CREATION=true to Generated.xcconfig by default
00:00 +1: (tearDownAll)
00:00 +1: All tests passed!
```