Remove some Undefined Behavior from run_customer_testing_tests.dart. - #193582

…13104)

Manual roll requested by [email protected]

flutter/flutter@d649d2b...e89fd0a

2026-10-01 [email protected] Manual roll ICU from 6ebb40c59477 to 5aa526207171 (2 revisions) (flutter/flutter#193661)
2026-10-01 [email protected] fix(web): hash source maps before rewriting sourceMappingURL with --web-content-hash (flutter/flutter#193614)
2026-10-01 [email protected] [flutter_tools] Bootstrap DeviceManager in ToolDependencies (flutter/flutter#193524)
2026-10-01 [email protected] [wasm] Set flutter_runtime_mode in tools/gn to_gn_wasm_args (flutter/flutter#193407)
2026-10-01 [email protected] Remove remaining `download_jdk` references (flutter/flutter#193562)
2026-10-01 [email protected] Synchronize dart2wasm feature probes in roll script and flutter_bootstrap.js (flutter/flutter#193271)
2026-10-01 [email protected] [web] Unskip web tests that now pass in gestures, services, and widgets (flutter/flutter#193512)
2026-10-01 [email protected] Roll Fuchsia Test Scripts from whZAV1mfT-Rdc0rQ8... to fCNknap4ZI0AMcvIf... (flutter/flutter#193640)
2026-10-01 [email protected] Roll Skia from 0575a37d0619 to f2d68e0b8863 (2 revisions) (flutter/flutter#193621)
2026-10-01 [email protected] perf(widgets): use const <Never>{} in InheritedModelElement and avoid redundant casts in RenderObjectElement.update (flutter/flutter#192913)
2026-10-01 [email protected] [web] Unskip and strengthen missing glyph tofu test on Wimp (flutter/flutter#193426)
2026-10-01 [email protected] [flutter_tools] Fix `flutter drive -d chrome` hanging on web (flutter/flutter#193459)
2026-10-01 [email protected] [web] Fix hang when Chromium cannot bind remote debugging port (flutter/flutter#193461)
2026-10-01 [email protected] [flutter_tools] Bundle data assets from hooks in flutter test (flutter/flutter#193435)
2026-10-01 [email protected] Roll Packages from 0ba9a82 to d5ec6db (11 revisions) (flutter/flutter#193641)
2026-10-01 [email protected] Revert: [flutter_tools] Fix DTD "Stream already subscribed" error and wait for analysis over DTD in widget preview (flutter/flutter#193637)
2026-10-01 [email protected] Roll Skia from 6182a3cf8f98 to 0575a37d0619 (5 revisions) (flutter/flutter#193613)
2026-10-01 [email protected] [flutter_tools] Fix DTD "Stream already subscribed" error and wait for analysis over DTD in widget preview (flutter/flutter#192930)
2026-09-30 [email protected] [Impeller] Sample the render target rect in offscreen advanced blends (flutter/flutter#192988)
2026-09-30 [email protected] Roll Skia from 01524014dff5 to 6182a3cf8f98 (11 revisions) (flutter/flutter#193594)
2026-09-30 [email protected] [web] Use Xvfb -displayfd and clean up Xvfb after Firefox test suites (flutter/flutter#193510)
2026-09-30 [email protected] Fixes bug where sibling node fail to update size (flutter/flutter#191220)
2026-09-30 [email protected] Roll Skia from c7b323126bf0 to 01524014dff5 (3 revisions) (flutter/flutter#193577)
2026-09-30 [email protected] Remove some Undefined Behavior from run_customer_testing_tests.dart. (flutter/flutter#193582)
2026-09-30 [email protected] Fix pointer id/coordinate mismatch in Android platform view multi-touch (flutter/flutter#191631)
2026-09-30 [email protected] Roll Packages from 3c6ce59 to 0ba9a82 (11 revisions) (flutter/flutter#193578)
2026-09-30 [email protected] Fix unresolved doc comment references in dev/ tooling (flutter/flutter#193501)

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Related to flutter#193579
Follow-up to flutter#193582 and
flutter#193664

Dart SDK commit 0171629a5478 migrated macOS process spawning to
`posix_spawn`. Under `posix_spawn` and Windows `CreateProcess`,
`Process.start` resolves relative executables against the caller's
working directory rather than the target `workingDirectory`.

While PR flutter#193582 and PR flutter#193664 addressed `customer_testing`, other
areas across the repository still invoke relative executables with
custom working directories directly via `Process.start` / `Process.run`.
This PR addresses the remaining locations:

1. **`dev/bots/suite_runners`**: Construct absolute script paths in
`run_add_to_app_life_cycle_tests.dart`, `run_docs_tests.dart`, and
`run_skp_generator_tests.dart`.
2. **`packages/flutter_tools`**: In `gradle_utils.dart`, resolve
`gradlew` / `gradlew.bat` via `androidDirectory.childFile(...)`.
3. **`dev/devicelab`**: In `utils.dart` `startProcess`, normalize
relative executables containing directory separators against
`finalWorkingDirectory`.
4. **Engine tooling**: Resolve absolute paths for `content_aware_hash`
in `web_ui/dev/common.dart` and `gradlew` in
`tools/gradle/generate_gradle_cipd_packages.dart`.

## Testing

- `flutter_tools`: Unit tests in
`packages/flutter_tools/test/general.shard/android/gradle_utils_test.dart`
and `project_test.dart` cover POSIX and Windows `gradlew` path
resolution.
- Test infrastructure (`dev/`, `engine/`): Validated via CI runs
(`test-exempt: changes to test infrastructure`).


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