[BUG] Construction of Interval restricted to numeric/ Timestamp/ Timedelta (#23013)

[makbigc]

• closes BUG: Interval should disallow Interval/Period objects as left/right endpoints #23013
• 1 test replaced
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[codecov]

Codecov Report

Merging #25768 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #25768   +/-   ##
=======================================
  Coverage   91.25%   91.25%           
=======================================
  Files         172      172           
  Lines       52965    52965           
=======================================
  Hits        48335    48335           
  Misses       4630     4630

Flag	Coverage Δ
#multiple	89.83% <ø> (ø)	⬆️
#single	41.74% <ø> (ø)	⬆️

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[codecov]

Codecov Report

Merging #25768 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #25768      +/-   ##
==========================================
+ Coverage   91.27%   91.27%   +<.01%     
==========================================
  Files         173      173              
  Lines       53002    53002              
==========================================
+ Hits        48375    48376       +1     
+ Misses       4627     4626       -1

Flag	Coverage Δ
#multiple	89.83% <ø> (ø)	⬆️
#single	41.76% <ø> (-0.01%)	⬇️

Impacted Files	Coverage Δ
pandas/util/testing.py	89.4% <0%> (+0.1%)	⬆️

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[jschendel]

Thanks! The issue itself didn't get much discussion, and I'm not sure if everyone will agree on this behavior, so will be interesting to see what comments arise here. I support this change, as it's consistent with what we allow for arrays, and as a result eliminates some weird Interval specific corner cases.

[jreback]

pls merge master

[jreback]

lgtm. @jschendel

[jschendel]

thanks @makbigc