Issue #2829533: Be consistent with 'Image Optimize' in the UI

config/schema/imageapi_optimize.schema.yml

imageapi_optimize.module

imageapi_optimize.permissions.yml

imageapi_optimize.routing.yml

src/Entity/ImageAPIOptimizePipeline.php

src/Form/ImageAPIOptimizePipelineEditForm.php

src/Form/ImageAPIOptimizePipelineFlushForm.php

src/Form/ImageAPIOptimizePipelineFormBase.php

src/Form/ImageAPIOptimizeProcessorDeleteForm.php

src/Form/ImageAPIOptimizeProcessorFormBase.php