Rework pipeline tests (#19366)

* Rework pipeline tests

* Try to fix Flax tests

* Try to put it before

* Use a new decorator instead

* Remove ignore marker since it doesn't work

* Filter pipeline tests

* Woopsie

* Use the fitlered list

* Clean up and fake modif

* Remove init

* Revert fake modif

tests/pipelines/test_pipelines_image_segmentation.py

@@ -31,15 +31,7 @@ from transformers import (
     is_vision_available,
     pipeline,
 )
-from transformers.testing_utils import (
-    is_pipeline_test,
-    nested_simplify,
-    require_tf,
-    require_timm,
-    require_torch,
-    require_vision,
-    slow,
-)
+from transformers.testing_utils import nested_simplify, require_tf, require_timm, require_torch, require_vision, slow
 
 from .test_pipelines_common import ANY, PipelineTestCaseMeta
 
@@ -62,7 +54,6 @@ def hashimage(image: Image) -> str:
 @require_vision
 @require_timm
 @require_torch
-@is_pipeline_test
 class ImageSegmentationPipelineTests(unittest.TestCase, metaclass=PipelineTestCaseMeta):
     model_mapping = {
         k: v