Check numpy and pandas import in examples

[thoo]

Fix #23134

[pep8speaks]

Hello @thoo! Thanks for submitting the PR.

• There are no PEP8 issues in the file scripts/tests/test_validate_docstrings.py !

• There are no PEP8 issues in the file scripts/validate_docstrings.py !

[codecov]

Codecov Report

Merging #23160 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #23160   +/-   ##
=======================================
  Coverage   92.14%   92.14%           
=======================================
  Files         170      170           
  Lines       51017    51017           
=======================================
  Hits        47011    47011           
  Misses       4006     4006

Flag	Coverage Δ
#multiple	90.57% <ø> (ø)	⬆️
#single	42.3% <ø> (ø)	⬆️

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