Remove boxplot from _dataframe_apply_whitelist

[jbrockmendel]

This is a piece of #17179, which is being broken up into smaller chunks.

• closes #xxxx
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[codecov]

Codecov Report

Merging #17381 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #17381      +/-   ##
==========================================
- Coverage   91.03%   91.02%   -0.02%     
==========================================
  Files         163      163              
  Lines       49570    49580      +10     
==========================================
  Hits        45128    45128              
- Misses       4442     4452      +10

Flag	Coverage Δ
#multiple	88.8% <100%> (ø)	⬆️
#single	40.26% <100%> (-0.06%)	⬇️

Impacted Files	Coverage Δ
pandas/core/groupby.py	92.21% <100%> (ø)	⬆️
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/frame.py	97.72% <0%> (-0.1%)	⬇️
pandas/core/indexes/base.py	95.84% <0%> (-0.04%)	⬇️
pandas/core/indexes/multi.py	96.9% <0%> (-0.03%)	⬇️
pandas/core/indexes/api.py	98.78% <0%> (ø)	⬆️
pandas/io/parsers.py	95.46% <0%> (ø)	⬆️
pandas/core/reshape/reshape.py	99.29% <0%> (ø)	⬆️
pandas/core/strings.py	98.46% <0%> (ø)	⬆️
pandas/core/sparse/scipy_sparse.py	97.05% <0%> (+0.08%)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #17381 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #17381      +/-   ##
==========================================
- Coverage   91.03%   91.02%   -0.02%     
==========================================
  Files         163      163              
  Lines       49570    49580      +10     
==========================================
  Hits        45128    45128              
- Misses       4442     4452      +10

Flag	Coverage Δ
#multiple	88.8% <100%> (ø)	⬆️
#single	40.26% <100%> (-0.06%)	⬇️

Impacted Files	Coverage Δ
pandas/core/groupby.py	92.21% <100%> (ø)	⬆️
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/frame.py	97.72% <0%> (-0.1%)	⬇️
pandas/core/indexes/base.py	95.84% <0%> (-0.04%)	⬇️
pandas/core/indexes/multi.py	96.9% <0%> (-0.03%)	⬇️
pandas/core/indexes/api.py	98.78% <0%> (ø)	⬆️
pandas/io/parsers.py	95.46% <0%> (ø)	⬆️
pandas/core/reshape/reshape.py	99.29% <0%> (ø)	⬆️
pandas/core/strings.py	98.46% <0%> (ø)	⬆️
pandas/core/sparse/scipy_sparse.py	97.05% <0%> (+0.08%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ad7d6fc...3a7a111. Read the comment docs.

[jreback]

thanks.