Add defensive check for argument errors keyword in to_numeric

[sumanau7]

• closes BUG: to_numeric does not validate the errors keyword #26394
• tests passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• Added defensive check for argument errors in func to_numeric

[gfyoung]

@sumanau7 : Thanks for the PR! Can you add a test and a whatsnew entry into v0.25.0.rst?

[sumanau7]

@gfyoung sure i will complete it within next 24 hours and update.

[codecov]

Codecov Report

Merging #26466 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #26466      +/-   ##
==========================================
- Coverage   91.74%   91.74%   -0.01%     
==========================================
  Files         174      174              
  Lines       50763    50765       +2     
==========================================
- Hits        46575    46574       -1     
- Misses       4188     4191       +3

Flag	Coverage Δ
#multiple	90.25% <100%> (ø)	⬆️
#single	41.69% <0%> (-0.1%)	⬇️

Impacted Files	Coverage Δ
pandas/core/tools/numeric.py	100% <100%> (ø)	⬆️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97.02% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.7% <0%> (+0.1%)	⬆️

---

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[codecov]

Codecov Report

Merging #26466 into master will decrease coverage by <.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master   #26466      +/-   ##
==========================================
- Coverage   91.74%   91.74%   -0.01%     
==========================================
  Files         174      174              
  Lines       50763    50765       +2     
==========================================
- Hits        46575    46573       -2     
- Misses       4188     4192       +4

Flag	Coverage Δ
#multiple	90.25% <50%> (-0.01%)	⬇️
#single	41.72% <0%> (-0.07%)	⬇️

Impacted Files	Coverage Δ
pandas/core/tools/numeric.py	98.55% <50%> (-1.45%)	⬇️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97.02% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.7% <0%> (+0.1%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[sumanau7]

@gfyoung Is it good now ?

[jorisvandenbossche]

@sumanau7 thanks a lot!