Issue #2829539 by Steven Jones: Add pipeline unit tests

config/install/imageapi_optimize.pipeline.local_binaries.yml

config/install/imageapi_optimize.pipeline.resmushit.yml

config/schema/imageapi_optimize.schema.yml

src/Entity/ImageStyleWithPipeline.php

src/Plugin/ImageAPIOptimizeProcessor/AdvPng.php

src/Plugin/ImageAPIOptimizeProcessor/JpegOptim.php

src/Plugin/ImageAPIOptimizeProcessor/OptiPng.php

src/Tests/FileMoveTest.php

src/Tests/ImageAdminStylesTest.php

src/Tests/ImageDimensionsTest.php

src/Tests/ImageEffectsTest.php

src/Tests/ImageFieldDefaultImagesTest.php

src/Tests/ImageFieldDisplayTest.php

src/Tests/ImageFieldValidateTest.php

src/Tests/ImageFieldWidgetTest.php

src/Tests/ImageOnTranslatedEntityTest.php

src/Tests/ImageStyleDeleteTest.php

src/Tests/ImageStyleFlushTest.php

src/Tests/ImageStylesPathAndUrlTest.php

src/Tests/ImageThemeFunctionTest.php