* Call image stream listeners with new flag

* Make _synchronousCall private

* Rename _synchronousCall parameter to be more descriptive and add more documentation

* Rename _hasInitialListeners to _addingInitialListeners and provide a better explanation

* Formatting fix

* Add tests

* Remove dependency on decoration_test.dart

* Simplify tests

* Remove empty line in comment

* Documentation

* Trigger tests

* Trigger tests

* Flip boolean value

The test was disabled for release branches because there were some
failures that got attributed to checking plugins from master.

Checking the logic of the test more closely it is already using a pinned
version of the plugins repository and it should be consistent on
pre/post submit validations.

Bug: https://github.com/flutter/flutter/issues/91935

Validate WebDriver responses

Fixes https://github.com/flutter/flutter/issues/96931.