TST: collect logical ops tests, use fixtures

[jbrockmendel]

Collect tests for logical ops |, &, ^.

Use fixtures in a couple of places in tests/arithmetic

Rename a couple of poorly named tests

No logic is changed, nothing is moved cross-module.

[pep8speaks]

Hello @jbrockmendel! Thanks for submitting the PR.

• There are no PEP8 issues in the file pandas/tests/arithmetic/test_timedelta64.py !

• There are no PEP8 issues in the file pandas/tests/frame/test_operators.py !

• There are no PEP8 issues in the file pandas/tests/frame/test_period.py !

• There are no PEP8 issues in the file pandas/tests/frame/test_timeseries.py !

• There are no PEP8 issues in the file pandas/tests/series/test_operators.py !

[codecov]

Codecov Report

Merging #23029 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #23029   +/-   ##
=======================================
  Coverage   92.19%   92.19%           
=======================================
  Files         169      169           
  Lines       50835    50835           
=======================================
  Hits        46868    46868           
  Misses       3967     3967

Flag	Coverage Δ
#multiple	90.61% <ø> (ø)	⬆️
#single	42.35% <ø> (ø)	⬆️

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[jreback]

thanks!