CLN: rename test method parameter name 'object' to 'self'

[topper-123]

As part of #26128, I saw that in three test methods, their first parameter has been named object rather than self. This rectifies that.

[codecov]

Codecov Report

Merging #26129 into master will decrease coverage by 51.24%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master   #26129       +/-   ##
===========================================
- Coverage   91.99%   40.74%   -51.25%     
===========================================
  Files         175      175               
  Lines       52387    52387               
===========================================
- Hits        48192    21345    -26847     
- Misses       4195    31042    +26847

Flag	Coverage Δ
#multiple	?
#single	40.74% <ø> (-0.13%)	⬇️

Impacted Files	Coverage Δ
pandas/io/formats/latex.py	0% <0%> (-100%)	⬇️
pandas/io/sas/sas_constants.py	0% <0%> (-100%)	⬇️
pandas/core/groupby/categorical.py	0% <0%> (-100%)	⬇️
pandas/tseries/plotting.py	0% <0%> (-100%)	⬇️
pandas/tseries/converter.py	0% <0%> (-100%)	⬇️
pandas/io/formats/html.py	0% <0%> (-99.37%)	⬇️
pandas/io/sas/sas7bdat.py	0% <0%> (-91.16%)	⬇️
pandas/io/sas/sas_xport.py	0% <0%> (-90.1%)	⬇️
pandas/core/tools/numeric.py	10.44% <0%> (-89.56%)	⬇️
pandas/io/s3.py	0% <0%> (-89.48%)	⬇️
... and 130 more

---

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[codecov]

Codecov Report

Merging #26129 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26129      +/-   ##
==========================================
- Coverage   91.99%   91.98%   -0.01%     
==========================================
  Files         175      175              
  Lines       52387    52387              
==========================================
- Hits        48192    48187       -5     
- Misses       4195     4200       +5

Flag	Coverage Δ
#multiple	90.53% <ø> (ø)	⬆️
#single	40.74% <ø> (-0.13%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	75% <0%> (-12.5%)	⬇️
pandas/core/frame.py	96.9% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.61% <0%> (-0.11%)	⬇️

---

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

Nice!

[WillAyd]

Thanks!