…s and execute tests" (#49908)

Reverts #49847
Initiated by: zanderso
This change reverts the following previous change:
Original Description:
This change is a redo of #49650.

https://github.com/zijiehe-google-com/engine/compare/de5c713..main should show the diff between this and the original change.

Following paragraph is copied from the original change.

This change requires flutter/buildroot#811, and can be executed from buildroot by

```
python3 flutter/tools/fuchsia/with_envs.py flutter/testing/fuchsia/run_tests.py
```

Bug: flutter/flutter#140179

- [V] I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
- [V] I read the [Tree Hygiene] wiki page, which explains my responsibilities.
- [V] I read and followed the [Flutter Style Guide] and the [C++, Objective-C, Java style guides].
- [V] I listed at least one issue that this PR fixes in the description above.
- [V] I added new tests to check the change I am making or feature I am adding, or the PR is [test-exempt]. See [testing the engine] for instructions on writing and running engine tests.
- [V] I updated/added relevant documentation (doc comments with `///`).
- [V] I signed the [CLA].
- [V] All existing and new tests are passing.

fixes flutter/flutter#141705

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

Tested: currently broken test!