Backport PR #25329 on branch 0.24.x (REGR: fix TimedeltaIndex sum and datetime subtraction with NaT (#25282, #25317))

[meeseeksmachine]

Backport PR #25329: REGR: fix TimedeltaIndex sum and datetime subtraction with NaT (#25282, #25317)

[codecov]

Codecov Report

Merging #25385 into 0.24.x will increase coverage by <.01%.
The diff coverage is 87.5%.

@@            Coverage Diff             @@
##           0.24.x   #25385      +/-   ##
==========================================
+ Coverage   92.39%   92.39%   +<.01%     
==========================================
  Files         166      166              
  Lines       52412    52417       +5     
==========================================
+ Hits        48428    48433       +5     
  Misses       3984     3984

Flag	Coverage Δ
#multiple	90.82% <87.5%> (-0.01%)	⬇️
#single	42.88% <37.5%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
pandas/core/indexes/base.py	96.55% <100%> (ø)	⬆️
pandas/core/arrays/datetimes.py	97.79% <100%> (ø)	⬆️
pandas/core/arrays/timedeltas.py	88.2% <75%> (-0.11%)	⬇️
pandas/util/testing.py	88.13% <0%> (+0.09%)	⬆️

---

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[codecov]

Codecov Report

Merging #25385 into 0.24.x will increase coverage by <.01%.
The diff coverage is 87.5%.

@@            Coverage Diff             @@
##           0.24.x   #25385      +/-   ##
==========================================
+ Coverage   92.39%   92.39%   +<.01%     
==========================================
  Files         166      166              
  Lines       52412    52417       +5     
==========================================
+ Hits        48428    48433       +5     
  Misses       3984     3984

Flag	Coverage Δ
#multiple	90.82% <87.5%> (-0.01%)	⬇️
#single	42.88% <37.5%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
pandas/core/indexes/base.py	96.55% <100%> (ø)	⬆️
pandas/core/arrays/datetimes.py	97.79% <100%> (ø)	⬆️
pandas/core/arrays/timedeltas.py	88.2% <75%> (-0.11%)	⬇️
pandas/util/testing.py	88.13% <0%> (+0.09%)	⬆️

---

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 48e9955...79d7dde. Read the comment docs.