Import pytest in flake8-pytest-style docs

[harupy]

Summary

Related to #6532 (comment), #2646

Import pytest in flake8-pytest-style docs for consistency and to make the examples runnable. Some examples still may contain undefined variables/functions, but that's out of the scope of this PR.

Test Plan

[github-actions]

PR Check Results

Ecosystem

✅ ecosystem check detected no changes.

Benchmark

Linux

group                                      main                                   pr
-----                                      ----                                   --
formatter/large/dataset.py                 1.01      4.6±0.05ms     8.8 MB/sec    1.00      4.6±0.03ms     8.8 MB/sec
formatter/numpy/ctypeslib.py               1.00    915.2±3.78µs    18.2 MB/sec    1.00    917.2±4.05µs    18.2 MB/sec
formatter/numpy/globals.py                 1.00     92.8±0.40µs    31.8 MB/sec    1.00     93.3±0.49µs    31.6 MB/sec
formatter/pydantic/types.py                1.00  1847.1±33.11µs    13.8 MB/sec    1.00  1849.0±34.40µs    13.8 MB/sec
linter/all-rules/large/dataset.py          1.01     12.8±0.29ms     3.2 MB/sec    1.00     12.7±0.08ms     3.2 MB/sec
linter/all-rules/numpy/ctypeslib.py        1.01      3.3±0.01ms     5.0 MB/sec    1.00      3.3±0.01ms     5.0 MB/sec
linter/all-rules/numpy/globals.py          1.00    465.3±0.99µs     6.3 MB/sec    1.01    469.0±2.26µs     6.3 MB/sec
linter/all-rules/pydantic/types.py         1.00      6.5±0.05ms     3.9 MB/sec    1.00      6.5±0.04ms     3.9 MB/sec
linter/default-rules/large/dataset.py      1.01      6.6±0.02ms     6.2 MB/sec    1.00      6.5±0.04ms     6.2 MB/sec
linter/default-rules/numpy/ctypeslib.py    1.00  1442.0±17.83µs    11.5 MB/sec    1.00  1436.2±21.79µs    11.6 MB/sec
linter/default-rules/numpy/globals.py      1.02    170.5±4.73µs    17.3 MB/sec    1.00    167.8±2.48µs    17.6 MB/sec
linter/default-rules/pydantic/types.py     1.00      2.9±0.01ms     8.7 MB/sec    1.00      2.9±0.02ms     8.7 MB/sec

Windows

group                                      main                                    pr
-----                                      ----                                    --
formatter/large/dataset.py                 1.07      4.8±0.32ms     8.5 MB/sec     1.00      4.5±0.30ms     9.1 MB/sec
formatter/numpy/ctypeslib.py               1.00   889.5±54.72µs    18.7 MB/sec     1.04   923.9±44.00µs    18.0 MB/sec
formatter/numpy/globals.py                 1.00     83.5±5.70µs    35.3 MB/sec     1.14    95.6±10.13µs    30.9 MB/sec
formatter/pydantic/types.py                1.00  1768.4±135.50µs    14.4 MB/sec    1.08  1901.3±100.74µs    13.4 MB/sec
linter/all-rules/large/dataset.py          1.00     15.2±0.65ms     2.7 MB/sec     1.00     15.2±0.54ms     2.7 MB/sec
linter/all-rules/numpy/ctypeslib.py        1.02      4.2±0.30ms     4.0 MB/sec     1.00      4.1±0.20ms     4.1 MB/sec
linter/all-rules/numpy/globals.py          1.06   542.4±21.31µs     5.4 MB/sec     1.00   512.6±33.50µs     5.8 MB/sec
linter/all-rules/pydantic/types.py         1.00      7.8±0.49ms     3.3 MB/sec     1.03      8.0±0.45ms     3.2 MB/sec
linter/default-rules/large/dataset.py      1.03      8.5±0.54ms     4.8 MB/sec     1.00      8.3±0.42ms     4.9 MB/sec
linter/default-rules/numpy/ctypeslib.py    1.00  1724.8±109.37µs     9.7 MB/sec    1.04  1787.9±79.75µs     9.3 MB/sec
linter/default-rules/numpy/globals.py      1.01   227.9±15.25µs    12.9 MB/sec     1.00   224.7±15.94µs    13.1 MB/sec
linter/default-rules/pydantic/types.py     1.00      3.7±0.23ms     7.0 MB/sec     1.04      3.8±0.24ms     6.7 MB/sec

[charliermarsh]

Thanks!