BUG: TDI/PI comparison with zero-dim array

[jbrockmendel]

• closes Comparison between TimedeltaIndex/PeriodIndex and 0-dim ndarray raises #26689
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

The long-term solution to problems of this kind will be #23853.

[codecov]

Codecov Report

Merging #26707 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #26707      +/-   ##
==========================================
- Coverage   91.88%   91.88%   -0.01%     
==========================================
  Files         174      174              
  Lines       50699    50702       +3     
==========================================
- Hits        46587    46586       -1     
- Misses       4112     4116       +4

Flag	Coverage Δ
#multiple	90.42% <100%> (ø)	⬆️
#single	41.93% <66.66%> (-0.09%)	⬇️

Impacted Files	Coverage Δ
pandas/core/arrays/period.py	98.54% <100%> (ø)	⬆️
pandas/core/arrays/timedeltas.py	88.82% <100%> (+0.02%)	⬆️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97% <0%> (-0.12%)	⬇️

---

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[codecov]

Codecov Report

Merging #26707 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #26707      +/-   ##
==========================================
- Coverage   91.88%   91.88%   -0.01%     
==========================================
  Files         174      174              
  Lines       50699    50702       +3     
==========================================
- Hits        46587    46586       -1     
- Misses       4112     4116       +4

Flag	Coverage Δ
#multiple	90.42% <100%> (ø)	⬆️
#single	41.93% <66.66%> (-0.09%)	⬇️

Impacted Files	Coverage Δ
pandas/core/arrays/period.py	98.54% <100%> (ø)	⬆️
pandas/core/arrays/timedeltas.py	88.82% <100%> (+0.02%)	⬆️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97% <0%> (-0.12%)	⬇️

---

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 5b10e31...bab377d. Read the comment docs.

[jreback]

thanks @jbrockmendel nice to have your PRs again!