Shorten the conversation tests for speed + fixing position overflows (#26960)

* Shorten the conversation tests for speed + fixing position overflows

* Put max_new_tokens back to 5

* Remove test skips

* Increase max_position_embeddings in blenderbot tests

* Add skips for blenderbot_small

* Correct TF test skip

* make fixup

* Reformat skips to use is_pipeline_test_to_skip

* Update tests/models/blenderbot_small/test_modeling_blenderbot_small.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update tests/models/blenderbot_small/test_modeling_flax_blenderbot_small.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

* Update tests/models/blenderbot_small/test_modeling_tf_blenderbot_small.py

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

---------

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

tests/models/blenderbot/test_modeling_blenderbot.py

@@ -85,7 +85,7 @@ class BlenderbotModelTester:
         hidden_act="gelu",
         hidden_dropout_prob=0.1,
         attention_probs_dropout_prob=0.1,
-        max_position_embeddings=20,
+        max_position_embeddings=50,
         eos_token_id=2,
         pad_token_id=1,
         bos_token_id=0,

tests/models/blenderbot/test_modeling_flax_blenderbot.py

@@ -87,7 +87,7 @@ class FlaxBlenderbotModelTester:
         hidden_act="gelu",
         hidden_dropout_prob=0.1,
         attention_probs_dropout_prob=0.1,
-        max_position_embeddings=32,
+        max_position_embeddings=50,
         eos_token_id=2,
         pad_token_id=1,
         bos_token_id=0,

tests/models/blenderbot/test_modeling_tf_blenderbot.py

@@ -53,7 +53,7 @@ class TFBlenderbotModelTester:
         intermediate_size=37,
         hidden_dropout_prob=0.1,
         attention_probs_dropout_prob=0.1,
-        max_position_embeddings=20,
+        max_position_embeddings=50,
         eos_token_id=2,
         pad_token_id=1,
         bos_token_id=0,