CI/TST #34131 fixed test_floordiv_axis0_numexpr_path
xref #34131 

- [ x ] passes `black pandas`
- [ x ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

Test `/pandas/tests/frame/test_floordiv_axis0_numexpr_path` is slow. It builds a df with 10^6 elements to tests functions `floordiv` and `pow`. The number of elements can be reduced with keeping the same min/max values inside the dataframe.

Before/after timeit comparison:
```
26.6 s ± 1.04 s per loop (mean ± std. dev. of 7 runs, 1 loop each)
37.6 ms ± 3.45 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
```