BENCH: fix timestamp asvs

[jbrockmendel]

• closes broken timestamp asvs #18680

[jbrockmendel]

appveyor error in TestDataFramePlots.test_parallel_coordinates_with_sorted_labels unrelated.

[codecov]

Codecov Report

Merging #18684 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18684      +/-   ##
==========================================
+ Coverage   91.57%   91.58%   +<.01%     
==========================================
  Files         153      153              
  Lines       51257    51254       -3     
==========================================
+ Hits        46937    46939       +2     
+ Misses       4320     4315       -5

Flag	Coverage Δ
#multiple	89.44% <ø> (+0.02%)	⬆️
#single	40.68% <ø> (-0.12%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/frame.py	97.81% <0%> (-0.1%)	⬇️
pandas/tseries/frequencies.py	94.02% <0%> (-0.08%)	⬇️
pandas/util/testing.py	82.01% <0%> (+0.19%)	⬆️
pandas/plotting/_converter.py	66.52% <0%> (+1.73%)	⬆️

---

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[codecov]

Codecov Report

Merging #18684 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18684      +/-   ##
==========================================
+ Coverage   91.57%   91.57%   +<.01%     
==========================================
  Files         153      153              
  Lines       51257    51263       +6     
==========================================
+ Hits        46937    46945       +8     
+ Misses       4320     4318       -2

Flag	Coverage Δ
#multiple	89.44% <ø> (+0.02%)	⬆️
#single	40.69% <ø> (-0.11%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/util/_test_decorators.py	93.33% <0%> (-1.91%)	⬇️
pandas/core/frame.py	97.81% <0%> (-0.1%)	⬇️
pandas/tseries/frequencies.py	94.02% <0%> (-0.08%)	⬇️
pandas/plotting/_converter.py	66.52% <0%> (+1.73%)	⬆️

---

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

Thanks!
(I removed the sample_time, let's deal with that in a coordinated way)