Remove annotations to make CI happy

[WillAyd]

I must have been a little quick in merging #26802 as it looks like this is causing mypy failures in CI.

Most of these are pretty niche and I think a result of import machinery. Will try to dive deeper later but this should get things green for now

[WillAyd]

Annotations might just not be possible here given the dynamic nature. Here's a relevant mypy discussion:

python/mypy#5059

[TomAugspurger]

Sorry about messing the types up.

It looks like azure didn't even run for that last commit. Strange.

[codecov]

Codecov Report

Merging #26820 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26820      +/-   ##
==========================================
- Coverage   91.86%   91.86%   -0.01%     
==========================================
  Files         179      179              
  Lines       50707    50707              
==========================================
- Hits        46583    46580       -3     
- Misses       4124     4127       +3

Flag	Coverage Δ
#multiple	90.45% <ø> (ø)	⬆️
#single	41.09% <ø> (-0.1%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gcs.py	100% <ø> (ø)	⬆️
pandas/io/s3.py	100% <ø> (ø)	⬆️
pandas/compat/_optional.py	100% <ø> (ø)	⬆️
pandas/io/gbq.py	88.88% <0%> (-11.12%)	⬇️
pandas/core/frame.py	96.88% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.94% <0%> (+0.1%)	⬆️

---

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[codecov]

Codecov Report

Merging #26820 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26820      +/-   ##
==========================================
- Coverage   91.86%   91.86%   -0.01%     
==========================================
  Files         179      179              
  Lines       50707    50706       -1     
==========================================
- Hits        46583    46579       -4     
- Misses       4124     4127       +3

Flag	Coverage Δ
#multiple	90.45% <ø> (-0.01%)	⬇️
#single	41.12% <ø> (-0.07%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gcs.py	100% <ø> (ø)	⬆️
pandas/io/s3.py	100% <ø> (ø)	⬆️
pandas/compat/_optional.py	100% <ø> (ø)	⬆️
pandas/io/gbq.py	88.88% <0%> (-11.12%)	⬇️
pandas/core/frame.py	96.88% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.94% <0%> (+0.1%)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 634577e...665f92f. Read the comment docs.

[jreback]

lgtm. merge on green.