add a final report to all pytest jobs

[stas00]

we had it added for one job (run_examples_torch), please add it to all pytest jobs - we need the output of what tests were run to debug the codecov issue. thank you!

To remind pytest -rA finalizes the test run with a report like this:

PASSED examples/seq2seq/test_seq2seq_examples.py::test_seq2seq_dataset_truncation[patrickvonplaten/t5-tiny-random]
PASSED examples/seq2seq/test_seq2seq_examples.py::test_seq2seq_dataset_truncation[sshleifer/bart-tiny-random]
PASSED examples/seq2seq/test_seq2seq_examples.py::test_seq2seq_dataset_truncation[google/pegasus-xsum]
PASSED examples/seq2seq/test_seq2seq_examples.py::test_legacy_dataset_truncation[sshleifer/bart-tiny-random]
PASSED examples/seq2seq/test_seq2seq_examples.py::test_legacy_dataset_truncation[bert-base-cased]
PASSED examples/test_examples.py::ExamplesTests::test_run_language_modeling
PASSED examples/test_examples.py::ExamplesTests::test_run_pl_glue
PASSED examples/test_examples.py::ExamplesTests::test_run_squad
PASSED examples/bert-loses-patience/test_run_glue_with_pabee.py::PabeeTests::test_run_glue
SKIPPED [1] examples/seq2seq/test_bash_script.py:25: too slow to run on CPU
SKIPPED [1] examples/seq2seq/test_bash_script.py:32: too slow to run on CPU

[codecov]

Codecov Report

Merging #6861 into master will increase coverage by 3.38%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6861      +/-   ##
==========================================
+ Coverage   76.81%   80.20%   +3.38%     
==========================================
  Files         157      157              
  Lines       28795    28795              
==========================================
+ Hits        22118    23094     +976     
+ Misses       6677     5701     -976     

Impacted Files	Coverage Δ
src/transformers/modeling_tf_electra.py	25.13% <0.00%> (-73.83%)	⬇️
src/transformers/modeling_tf_openai.py	22.58% <0.00%> (-72.26%)	⬇️
src/transformers/tokenization_bart.py	42.10% <0.00%> (-57.90%)	⬇️
src/transformers/modeling_marian.py	60.00% <0.00%> (-30.00%)	⬇️
src/transformers/modeling_t5.py	77.63% <0.00%> (-6.02%)	⬇️
src/transformers/activations.py	85.00% <0.00%> (-5.00%)	⬇️
src/transformers/tokenization_dpr.py	53.15% <0.00%> (-4.51%)	⬇️
src/transformers/tokenization_auto.py	95.55% <0.00%> (-2.23%)	⬇️
src/transformers/modeling_openai.py	80.96% <0.00%> (-1.30%)	⬇️
src/transformers/modeling_bart.py	95.08% <0.00%> (-0.51%)	⬇️
... and 25 more

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