Issue #3272581 by danflanagan8: Image tests should not rely on Classy

...dules/image/tests/src/Functional/ImageAdminStylesTest.php

...odules/image/tests/src/Functional/ImageDimensionsTest.php

...es/image/tests/src/Functional/ImageEffect/ConvertTest.php

...mage/tests/src/Functional/ImageFieldDefaultImagesTest.php

...ules/image/tests/src/Functional/ImageFieldDisplayTest.php

...les/image/tests/src/Functional/ImageFieldValidateTest.php

...e/tests/src/FunctionalJavascript/ImageAdminStylesTest.php