🚨 rm already deprecated pad_to_max_length arg (#37617)

* rm already deprecated padding max length

* truncate_strategy AS AN ARG is already deprecated for a few years

* fix

* rm test_padding_to_max_length

* rm pad_to_max_length=True in other tests

* rm from common

* missed fnet

tests/models/encoder_decoder/test_modeling_encoder_decoder.py

@@ -829,7 +829,6 @@ class BertEncoderDecoderModelTest(EncoderDecoderMixin, unittest.TestCase):
         input_dict = tokenizer(
             [ARTICLE_SIGMA, ARTICLE_AMERICA],
             padding="max_length",
-            pad_to_max_length=True,
             max_length=512,
             return_tensors="pt",
         )