add a final report to all pytest jobs
Author: stas00
Pull request: yes

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
```

Comments:
# [Codecov](https://codecov.io/gh/huggingface/transformers/pull/6861?src=pr&el=h1) Report
> Merging [#6861](https://codecov.io/gh/huggingface/transformers/pull/6861?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/431ab19d7a467905018b165bc29b2a1130c1b188?el=desc) will **increase** coverage by `3.38%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/6861/graphs/tree.svg?width=650&height=150&src=pr&token=9qOlN6Hb1c)](https://codecov.io/gh/huggingface/transformers/pull/6861?src=pr&el=tree)

```diff
@@            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](https://codecov.io/gh/huggingface/transformers/pull/6861?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [src/transformers/modeling\_tf\_electra.py](https://codecov.io/gh/huggingface/transformers/pull/6861/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9lbGVjdHJhLnB5) | `25.13% <0.00%> (-73.83%)` | :arrow_down: |
| [src/transformers/modeling\_tf\_openai.py](https://codecov.io/gh/huggingface/transformers/pull/6861/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9vcGVuYWkucHk=) | `22.58% <0.00%> (-72.26%)` | :arrow_down: |
| [src/transformers/tokenization\_bart.py](https://codecov.io/gh/huggingface/transformers/pull/6861/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy90b2tlbml6YXRpb25fYmFydC5weQ==) | `42.10% <0.00%> (-57.90%)` | :arrow_down: |
| [src/transformers/modeling\_marian.py](https://codecov.io/gh/huggingface/transformers/pull/6861/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ19tYXJpYW4ucHk=) | `60.00% <0.00%> (-30.00%)` | :arrow_down: |
| [src/transformers/modeling\_t5.py](https://codecov.io/gh/huggingface/transformers/pull/6861/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190NS5weQ==) | `77.63% <0.00%> (-6.02%)` | :arrow_down: |
| [src/transformers/activations.py](https://codecov.io/gh/huggingface/transformers/pull/6861/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9hY3RpdmF0aW9ucy5weQ==) | `85.00% <0.00%> (-5.00%)` | :arrow_down: |
| [src/transformers/tokenization\_dpr.py](https://codecov.io/gh/huggingface/transformers/pull/6861/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy90b2tlbml6YXRpb25fZHByLnB5) | `53.15% <0.00%> (-4.51%)` | :arrow_down: |
| [src/transformers/tokenization\_auto.py](https://codecov.io/gh/huggingface/transformers/pull/6861/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy90b2tlbml6YXRpb25fYXV0by5weQ==) | `95.55% <0.00%> (-2.23%)` | :arrow_down: |
| [src/transformers/modeling\_openai.py](https://codecov.io/gh/huggingface/transformers/pull/6861/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ19vcGVuYWkucHk=) | `80.96% <0.00%> (-1.30%)` | :arrow_down: |
| [src/transformers/modeling\_bart.py](https://codecov.io/gh/huggingface/transformers/pull/6861/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ19iYXJ0LnB5) | `95.08% <0.00%> (-0.51%)` | :arrow_down: |
| ... and [25 more](https://codecov.io/gh/huggingface/transformers/pull/6861/diff?src=pr&el=tree-more) | |

------

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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/huggingface/transformers/pull/6861?src=pr&el=footer). Last update [431ab19...39d237c](https://codecov.io/gh/huggingface/transformers/pull/6861?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).