Revert "[Doctests] Refactor doctests + add CI" (#23245)

Revert "[Doctests] Refactor doctests + add CI (#22987)"

This reverts commit 627f44799a.

conftest.py

@@ -20,10 +20,6 @@ import sys
 import warnings
 from os.path import abspath, dirname, join
 
-import _pytest
-
-from transformers.utils.doctest_utils import HfDoctestModule, HfDocTestParser
-
 
 # allow having multiple repository checkouts and not needing to remember to rerun
 # 'pip install -e .[dev]' when switching between checkouts and running tests.
@@ -42,7 +38,9 @@ def pytest_configure(config):
     config.addinivalue_line(
         "markers", "is_pt_flax_cross_test: mark test to run only when PT and FLAX interactions are tested"
     )
-    config.addinivalue_line("markers", "is_pipeline_test: mark test to run only when pipelines are tested")
+    config.addinivalue_line(
+        "markers", "is_pipeline_test: mark test to run only when pipelines are tested"
+    )
     config.addinivalue_line("markers", "is_staging_test: mark test to run only in the staging environment")
     config.addinivalue_line("markers", "accelerate_tests: mark test that require accelerate")
 
@@ -68,7 +66,7 @@ def pytest_sessionfinish(session, exitstatus):
 
 
 # Doctest custom flag to ignore output.
-IGNORE_RESULT = doctest.register_optionflag("IGNORE_RESULT")
+IGNORE_RESULT = doctest.register_optionflag('IGNORE_RESULT')
 
 OutputChecker = doctest.OutputChecker
 
@@ -81,5 +79,3 @@ class CustomOutputChecker(OutputChecker):
 
 
 doctest.OutputChecker = CustomOutputChecker
-_pytest.doctest.DoctestModule = HfDoctestModule
-doctest.DocTestParser = HfDocTestParser